Method for transmitting uplink signal in wireless communication system and apparatus therefor

ABSTRACT

A method for transmitting an uplink signal in multiple serving cells in a wireless communication system according to one embodiment of the present disclosure is performed by a terminal and may comprise the steps of: receiving a configuration of whether to activate an operation of repeating or segmenting a physical uplink control channel (PUCCH) in at least one secondary serving cell; and repeating or segmenting and transmitting a PUCCH in the at least one secondary serving cell according to the received configuration, wherein the configuration comprises information on the secondary serving cell and/or a bandwidth part (BWP) in which the repetition or segmentation operation is to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/612,227, filed on Nov. 8, 2019, which is a National Stage applicationunder 35 U.S.C. § 371 of International Application No.PCT/KR2018/005347, filed on May 10, 2018, which claims the benefit ofU.S. Provisional Application No. 62/586,142, filed on Nov. 14, 2017,U.S. Provisional Application No. 62/541,105, filed on Aug. 4, 2017, U.S.Provisional Application No. 62/519,863, filed on Jun. 14, 2017, U.S.Provisional Application No. 62/518,511, filed on Jun. 12, 2017, and U.S.Provisional Application No. 62/503,944, filed on May 10, 2017. Thedisclosures of the prior applications are incorporated by reference intheir entirety.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting an uplinksignal or receiving a downlink signal.

BACKGROUND

The next-generation system seeks to use a wide frequency band andsupport various services or requirements. For example, in regard to the3^(rd) generation partnership project (3GPP) new radio access technology(NR) requirements, one of representative scenarios, ultra-reliable andlow latency communications (URLLC) has the requirements of low latencyand high reliability with a user-plane latency of 0.5 ms andtransmission of X-byte data in 1 ms at or below an error rate of10{circumflex over ( )}−5. While enhanced mobile broadband (eMBB)generally has a large traffic capacity, URLLC traffic ranges from tensof bytes to hundreds of bytes in file size and occurs sporadically.Accordingly, transmission that maximizes a transmission rate andminimizes the overhead of control information is required in eMBB, and areliable transmission scheme with a short scheduling time unit isrequired in URLLC.

SUMMARY

An aspect of the present disclosure is to provide a user equipment (UE)operation for transmit diversity or a related base station (BS) orsystem operation.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

In an aspect of the present disclosure, a method of transmitting anuplink signal in a plurality of serving cells, performed by a userequipment (UE), in a wireless communication system includes receiving aconfiguration indicating whether a repetition operation or asegmentation operation is enabled for a physical uplink control channel(PUCCH) in at least one secondary serving cell, and transmitting thePUCCH by repeating or segmenting the PUCCH in the at least one secondaryserving cell according to the received configuration. The configurationincludes information about a secondary serving cell and/or a bandwidthpart (BWP) subjected to the repetition operation or the segmentationoperation.

Additionally or alternatively, the method may further includes receivinga resource offset to determine a resource for use in transmitting thePUCCH in the secondary serving cell and/or the BWP, and determining theresource for use in transmitting the PUCCH based on the resource offset.

Additionally or alternatively, a resource offset may be configured foreach secondary serving cell and/or each BWP, and a PUCCH resource in thesecondary serving cell and/or the BWP may be determined to be a PUCCHresource spaced from a PUCCH resource indicated by the receivedconfiguration by the resource offset for the secondary serving celland/or the BWP.

Additionally or alternatively, a physical uplink shared channel (PUSCH)scheduled in a part of the at least one secondary serving cell may bedropped.

Additionally or alternatively, when a simultaneous PUCCH and PUSCHtransmission is configured for the UE, priority for transmission powerallocation may be determined according to a channel type, a serving cellindex, and whether uplink control information (UCI) is included.

Additionally or alternatively, the information about the secondaryserving cell and/or the BWP subjected to the repetition operation or thesegmentation operation may be changed by downlink control information(DCI) related to the PUCCH.

Additionally or alternatively, the PUCCH may be mapped to a differentsecondary serving cell and/or BWP in each symbol.

Additionally or alternatively, each state of a specific field in the DCImay be mapped to one of a plurality of secondary serving cells and/orBWPs, and upon receipt of the DCI, a repetition or segment of the PUCCHmay be transmitted in at least one secondary serving cell and/or BWPselected from among the plurality of secondary serving cells and/orBWPs.

In another aspect of the present disclosure, a UE for transmitting anuplink signal in a plurality of serving cells in a wirelesscommunication system includes a receiver and a transmitter, and aprocessor configured to control the receiver and the transmitter. Theprocessor is configured to receive a configuration indicating whether arepetition operation or a segmentation operation is enabled for aphysical uplink control channel (PUCCH) in at least one secondaryserving cell, and transmit the PUCCH by repeating or segmenting thePUCCH in the at least one secondary serving cell according to thereceived configuration. The configuration includes information about asecondary serving cell and/or a BWP subjected to the repetitionoperation or the segmentation operation.

Additionally or alternatively, the processor may be configured toreceive a resource offset to determine a resource for use intransmitting the PUCCH in the secondary serving cell and/or the BWP, anddetermine the resource for use in transmitting the PUCCH based on theresource offset.

Additionally or alternatively, a resource offset may be configured foreach secondary serving cell and/or each BWP, and a PUCCH resource in thesecondary serving cell and/or the BWP may be determined to be a PUCCHresource spaced from a PUCCH resource indicated by the receivedconfiguration by the resource offset for the secondary serving celland/or the BWP.

Additionally or alternatively, a PUSCH scheduled in a part of the atleast one secondary serving cell may be dropped.

Additionally or alternatively, when a simultaneous PUCCH and PUSCHtransmission is configured for the UE, priority for transmission powerallocation may be determined according to a channel type, a serving cellindex, and whether UCI is included.

Additionally or alternatively, the information about the secondaryserving cell and/or the BWP subjected to the repetition operation or thesegmentation operation may be changed by DCI related to the PUCCH.

Additionally or alternatively, the PUCCH may be mapped to a differentsecondary serving cell and/or BWP in each symbol.

Additionally or alternatively, each state of a specific field in the DCImay correspond to one of a plurality of secondary serving cells and/orBWPs, and upon receipt of the DCI, a repetition or segment of the PUCCHmay be transmitted in at least one secondary serving cell and/or BWPselected from among the plurality of secondary serving cells and/orBWPs.

Additionally or alternatively, the UE is a part of an autonomous drivingdevice that communicates with at least one of a network or anotherautonomous driving vehicle.

The above-described aspects of the present disclosure are merely partsof the embodiments of the present disclosure. It will be understood bythose skilled in the art that various embodiments are derived from thefollowing detailed description of the present disclosure withoutdeparting from the technical features of the disclosure.

According to the embodiments of the present disclosure, an uplinktransmission may be efficiently performed.

It will be appreciated by persons skilled in the art that the effectsthat can be achieved with the present disclosure are not limited to whathas been particularly described hereinabove and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIGS. 1A and 1B are diagrams for an example of a radio frame structureused in wireless communication system;

FIG. 2 is a diagram for an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system;

FIG. 3 is a diagram for an example of a DL subframe structure used in a3^(rd) generation partnership project (3GPP) long term evolution(LTE)/long term evolution-advanced (LTE-A) system;

FIG. 4 is a diagram for an example of a UL subframe structure used inthe 3GPP LTE/LTE-A system;

FIG. 5 illustrates a decrease in the length of a transmission timeinterval (TTI) according to reduction in user-plane latency;

FIG. 6 illustrates an example of configuring a plurality of short TTIsin one subframe;

FIGS. 7A to 7D illustrate the structures of DL subframes including shortTTIs of multiple lengths (various numbers of symbols);

FIGS. 8A and 8B illustrate the structures of DL subframes includingshort TTIs of 2 and 3 symbols;

FIG. 9 illustrates repetition or segmentation of data packets allocatedto multiple component carriers (CCs) or transmission and receptionpoints (TRPs);

FIG. 10 illustrates exemplary iterative decoding of downlink controlinformation (DCI); and

FIG. 11 is a block diagram for a device configured to implementembodiment(s) of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to the preferred embodiments of thepresent disclosure, examples of which are illustrated in theaccompanying drawings. The accompanying drawings illustrate exemplaryembodiments of the present disclosure and provide a more detaileddescription of the present disclosure. However, the scope of the presentdisclosure should not be limited thereto.

In some cases, to prevent the concept of the present disclosure frombeing ambiguous, structures and apparatuses of the known art will beomitted or will be shown in the form of a block diagram based on mainfunctions of each structure and apparatus. Also, wherever possible, thesame reference numbers will be used throughout the drawings and thespecification to refer to the same or like parts.

In the present disclosure, a user equipment (UE) is fixed or mobile. TheUE is a device that transmits and receives user data and/or controlinformation by communicating with a base station (BS). The term ‘UE’ maybe replaced with ‘terminal equipment’, ‘mobile station (MS)’, ‘mobileterminal (MT)’, ‘user terminal (UT)’, ‘subscriber station (SS)’,‘wireless device’, ‘personal digital assistant (PDA)’, ‘wireless modem’,‘handheld device’, etc. A BS is typically a fixed station thatcommunicates with a UE and/or another BS. The BS exchanges data andcontrol information with a UE and another BS. The term ‘BS’ may bereplaced with ‘advanced base station (ABS)’, ‘Node B’, ‘evolved-Node B(eNB)’, ‘base transceiver system (BTS)’, ‘access point (AP)’,‘processing server (PS)’, etc. In the following description, BS iscommonly called eNB.

In the present disclosure, a node refers to a fixed point capable oftransmitting/receiving a radio signal to/from a UE by communication withthe UE. Various eNBs can be used as nodes. For example, a node can be aBS, NB, eNB, pico-cell eNB (PeNB), home eNB (HeNB), relay, repeater,etc. Furthermore, a node may not be an eNB. For example, a node can be aradio remote head (RRH) or a radio remote unit (RRU). The RRH and RRUhave power levels lower than that of the eNB. Since the RRH or RRU(referred to as RRH/RRU hereinafter) is connected to an eNB through adedicated line such as an optical cable in general, cooperativecommunication according to RRH/RRU and eNB can be smoothly performedcompared to cooperative communication according to eNBs connectedthrough a wireless link. At least one antenna is installed per node. Anantenna may refer to an antenna port, a virtual antenna or an antennagroup. A node may also be called a point. Unlink a conventionalcentralized antenna system (CAS) (i.e. single node system) in whichantennas are concentrated in an eNB and controlled an eNB controller,plural nodes are spaced apart at a predetermined distance or longer in amulti-node system. The plural nodes can be managed by one or more eNBsor eNB controllers that control operations of the nodes or schedule datato be transmitted/received through the nodes. Each node may be connectedto an eNB or eNB controller managing the corresponding node via a cableor a dedicated line. In the multi-node system, the same cell identity(ID) or different cell IDs may be used for signal transmission/receptionthrough plural nodes. When plural nodes have the same cell ID, each ofthe plural nodes operates as an antenna group of a cell. If nodes havedifferent cell IDs in the multi-node system, the multi-node system canbe regarded as a multi-cell (e.g. macro-cell/femto-cell/pico-cell)system. When multiple cells respectively configured by plural nodes areoverlaid according to coverage, a network configured by multiple cellsis called a multi-tier network. The cell ID of the RRH/RRU may beidentical to or different from the cell ID of an eNB. When the RRH/RRUand eNB use different cell IDs, both the RRH/RRU and eNB operate asindependent eNBs.

In a multi-node system according to the present disclosure, which willbe described below, one or more eNBs or eNB controllers connected toplural nodes can control the plural nodes such that signals aresimultaneously transmitted to or received from a UE through some or allnodes. While there is a difference between multi-node systems accordingto the nature of each node and implementation form of each node,multi-node systems are discriminated from single node systems (e.g. CAS,conventional MIMO systems, conventional relay systems, conventionalrepeater systems, etc.) since a plurality of nodes providescommunication services to a UE in a predetermined time-frequencyresource. Accordingly, embodiments of the present disclosure withrespect to a method of performing coordinated data transmission usingsome or all nodes can be applied to various types of multi-node systems.For example, a node refers to an antenna group spaced apart from anothernode by a predetermined distance or more, in general. However,embodiments of the present disclosure, which will be described below,can even be applied to a case in which a node refers to an arbitraryantenna group irrespective of node interval. In the case of an eNBincluding an X-pole (cross polarized) antenna, for example, theembodiments of the preset disclosure are applicable on the assumptionthat the eNB controls a node composed of an H-pole antenna and a V-poleantenna.

A communication scheme through which signals are transmitted/receivedvia plural transmit (Tx)/receive (Rx) nodes, signals aretransmitted/received via at least one node selected from plural Tx/Rxnodes, or a node transmitting a downlink (DL) signal is discriminatedfrom a node transmitting an uplink (UL) signal is called multi-eNBmultiple input multiple output (MIMO) or coordinated multi-point Tx/Rx(CoMP). Coordinated transmission schemes from among CoMP communicationschemes can be categorized into joint processing (JP) and schedulingcoordination. The former may be divided into joint transmission(JT)/joint reception (JR) and dynamic point selection (DPS) and thelatter may be divided into coordinated scheduling (CS) and coordinatedbeamforming (CB). DPS may be called dynamic cell selection (DCS). WhenJP is performed, more various communication environments can begenerated, compared to other CoMP schemes. JT refers to a communicationscheme by which plural nodes transmit the same stream to a UE and JRrefers to a communication scheme by which plural nodes receive the samestream from the UE. The UE/eNB combine signals received from the pluralnodes to restore the stream. In the case of JT/JR, signal transmissionreliability can be improved according to transmit diversity since thesame stream is transmitted from/to plural nodes. DPS refers to acommunication scheme by which a signal is transmitted/received through anode selected from plural nodes according to a specific rule. In thecase of DPS, signal transmission reliability can be improved because anode having a good channel state between the node and a UE is selectedas a communication node.

In the present disclosure, a cell refers to a specific geographical areain which one or more nodes provide communication services. Accordingly,communication with a specific cell may mean communication with an eNB ora node providing communication services to the specific cell. A DL/ULsignal of a specific cell refers to a DL/UL signal from/to an eNB or anode providing communication services to the specific cell. A cellproviding UL/DL communication services to a UE is called a serving cell.Furthermore, channel status/quality of a specific cell refers to channelstatus/quality of a channel or a communication link generated between aneNB or a node providing communication services to the specific cell anda UE. In 3GPP LTE-A systems, a UE can measure DL channel state from aspecific node using one or more channel state information referencesignals (CSI-RSs) transmitted through antenna port(s) of the specificnode on a CSI-RS resource allocated to the specific node. In general,neighboring nodes transmit CSI-RS resources on orthogonal CSI-RSresources. When CSI-RS resources are orthogonal, this means that theCSI-RS resources have different subframe configurations and/or CSI-RSsequences which specify subframes to which CSI-RSs are allocatedaccording to CSI-RS resource configurations, subframe offsets andtransmission periods, etc. which specify symbols and subcarrierscarrying the CSI RSs.

In the present disclosure, physical DL control channel (PDCCH)/physicalcontrol format indicator channel (PCFICH)/physical hybrid automaticrepeat request indicator channel (PHICH)/physical DL shared channel(PDSCH) refer to a set of time-frequency resources or resource elementsrespectively carrying DL control information (DCI)/control formatindicator (CFI)/DL acknowledgement (ACK)/negative ACK (NACK)/DL data. Inaddition, physical UL control channel (PUCCH)/physical UL shared channel(PUSCH)/physical random access channel (PRACH) refer to sets oftime-frequency resources or resource elements respectively carrying ULcontrol information (UCI)/UL data/random access signals. In the presentdisclosure, a time-frequency resource or a resource element (RE), whichis allocated to or belongs toPDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH, is referred to as aPDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH RE orPDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH resource. In the followingdescription, transmission of PUCCH/PUSCH/PRACH by a UE is equivalent totransmission of UL control information/UL data/random access signalthrough or on PUCCH/PUSCH/PRACH. Furthermore, transmission ofPDCCH/PCFICH/PHICH/PDSCH by an eNB is equivalent to transmission of DLdata/control information through or on PDCCH/PCFICH/PHICH/PDSCH.

FIGS. 1A and 1B illustrate an exemplary radio frame structure used in awireless communication system. FIG. 1A illustrates a frame structure forfrequency division duplex (FDD) used in 3GPP LTE/LTE-A and FIG. 1Billustrates a frame structure for time division duplex (TDD) used in3GPP LTE/LTE-A.

Referring to FIGS. 1A and 1B, a radio frame used in 3GPP LTE/LTE-A has alength of 10 ms (307200 Ts) and includes 10 subframes in equal size. The10 subframes in the radio frame may be numbered. Here, Ts denotessampling time and is represented as Ts=1/(2048*15 kHz). Each subframehas a length of 1 ms and includes two slots. 20 slots in the radio framecan be sequentially numbered from 0 to 19. Each slot has a length of 0.5ms. A time for transmitting a subframe is defined as a transmission timeinterval (TTI). Time resources can be discriminated by a radio framenumber (or radio frame index), subframe number (or subframe index) and aslot number (or slot index).

The radio frame can be configured differently according to duplex mode.Downlink transmission is discriminated from UL transmission by frequencyin FDD mode, and thus the radio frame includes only one of a DL subframeand an UL subframe in a specific frequency band. In TDD mode, DLtransmission is discriminated from UL transmission by time, and thus theradio frame includes both a DL subframe and an UL subframe in a specificfrequency band.

Table 1 shows DL-UL configurations of subframes in a radio frame in theTDD mode.

TABLE 1 Downlink- DL-UL to-Uplink config- Switch-point Subframe numberuration periodicity 0 1 2 3 4 5 6 7 8 9 0  5 ms D S U U U D S U U U 1  5ms D S U U D D S U U D 2  5 ms D S U D D D S U D D 3 10 ms D S U U U D DD D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6  5 ms DS U U U D S U U D

In Table 1, D denotes a DL subframe, U denotes an UL subframe and Sdenotes a special subframe. The special subframe includes three fieldsof DwPTS (Downlink Pilot Time Slot), GP (Guard Period), and UpPTS(Uplink Pilot Time Slot). DwPTS is a period reserved for DL transmissionand UpPTS is a period reserved for UL transmission. Table 2 showsspecial subframe configuration.

TABLE 2 Normal cyclic prefix in DL Extended cyclic prefix in DL SpecialUpPTS UpPTS subframe Normal Extended Normal Extended config- cyclicprefix cyclic prefix cyclic prefix cyclic prefix uration DwPTS in UL inUL DwPTS in UL in UL 0  6592 · T_(s) 2192 · T_(s) 2560 · T_(s)  7680 ·T_(s) 2192 · T_(s) 2560 · T_(s) 1 19760 · T_(s) 20480 · T_(s) 2 21952 ·T_(s) 23040 · T_(s) 3 24144 · T_(s) 25600 · T_(s) 4 26336 · T_(s)  7680· T_(s) 4384 · T_(s) 5120 · T_(s) 5  6592 · T_(s) 4384 · T_(s) 5120 ·T_(s) 20480 · T_(s) 6 19760 · T_(s) 23040 · T_(s) 7 21952 · T_(s) 12800· T_(s) 8 24144 · T_(s) — — — 9 13168 · T_(s) — — —

FIG. 2 illustrates an exemplary DL/UL slot structure in a wirelesscommunication system. Particularly, FIG. 2 illustrates a resource gridstructure in 3GPP LTE/LTE-A. A resource grid is present per antennaport.

Referring to FIG. 2 , a slot includes a plurality of OFDM (OrthogonalFrequency Division Multiplexing) symbols in the time domain and aplurality of resource blocks (RBs) in the frequency domain. An OFDMsymbol may refer to a symbol period. A signal transmitted in each slotmay be represented by a resource grid composed of N_(RB) ^(DL/UL)*N_(sc)^(RB) subcarriers and N_(symb) ^(DL/UL) OFDM symbols. Here, N_(RB) ^(DL)denotes the number of RBs in a DL slot and N_(RB) ^(UL) denotes thenumber of RBs in an UL slot. N_(RB) ^(DL) and N_(RB) ^(UL) respectivelydepend on a DL transmission bandwidth and a UL transmission bandwidth.N_(symb) ^(DL) denotes the number of OFDM symbols in the DL slot andN_(symb) ^(UL) denotes the number of OFDM symbols in the UL slot. Inaddition, N_(sc) ^(RB) denotes the number of subcarriers constructingone RB.

An OFDM symbol may be called a single carrier frequency divisionmultiplexing (SC-FDM) symbol according to multiple access scheme. Thenumber of OFDM symbols included in a slot may depend on a channelbandwidth and the length of a cyclic prefix (CP). For example, a slotincludes 7 OFDM symbols in the case of normal CP and 6 OFDM symbols inthe case of extended CP. While FIG. 2 illustrates a subframe in which aslot includes 7 OFDM symbols for convenience, embodiments of the presentdisclosure can be equally applied to subframes having different numbersof OFDM symbols. Referring to FIG. 2 , each OFDM symbol includes N_(RB)^(DL/UL)*N_(sc) ^(RB) subcarriers in the frequency domain. Subcarriertypes can be classified into a data subcarrier for data transmission, areference signal subcarrier for reference signal transmission, and nullsubcarriers for a guard band and a direct current (DC) component. Thenull subcarrier for a DC component is a subcarrier remaining unused andis mapped to a carrier frequency (f0) during OFDM signal generation orfrequency up-conversion. The carrier frequency is also called a centerfrequency.

An RB is defined by N_(symb) ^(DL/UL) (e.g. 7) consecutive OFDM symbolsin the time domain and N_(sc) ^(RB) (e.g. 12) consecutive subcarriers inthe frequency domain. For reference, a resource composed by an OFDMsymbol and a subcarrier is called a resource element (RE) or a tone.Accordingly, an RB is composed of N_(symb) ^(DL/UL)*N_(sc) ^(RB) REs.Each RE in a resource grid can be uniquely defined by an index pair (k,l) in a slot. Here, k is an index in the range of 0 to N_(symb)^(DL/UL)*N_(sc) ^(RB)−1 in the frequency domain and l is an index in therange of 0 to N_(symb) ^(DL/UL)−1.

Two RBs that occupy N_(sc) ^(RB) consecutive subcarriers in a subframeand respectively disposed in two slots of the subframe are called aphysical resource block (PRB) pair. Two RBs constituting a PRB pair havethe same PRB number (or PRB index). A virtual resource block (VRB) is alogical resource allocation unit for resource allocation. The VRB hasthe same size as that of the PRB. The VRB may be divided into alocalized VRB and a distributed VRB depending on a mapping scheme of VRBinto PRB. The localized VRBs are mapped into the PRBs, whereby VRBnumber (VRB index) corresponds to PRB number. That is, n_(PRB)=n_(VRB)is obtained. Numbers are given to the localized VRBs from 0 to N_(VRB)^(DL)−1, and N_(VRB) ^(DL)=N_(RB) ^(DL) is obtained. Accordingly,according to the localized mapping scheme, the VRBs having the same VRBnumber are mapped into the PRBs having the same PRB number at the firstslot and the second slot. On the other hand, the distributed VRBs aremapped into the PRBs through interleaving. Accordingly, the VRBs havingthe same VRB number may be mapped into the PRBs having different PRBnumbers at the first slot and the second slot. Two PRBs, which arerespectively located at two slots of the subframe and have the same VRBnumber, will be referred to as a pair of VRBs.

FIG. 3 illustrates a DL subframe structure used in 3GPP LTE/LTE-A.

Referring to FIG. 3 , a DL subframe is divided into a control region anda data region. A maximum of three (four) OFDM symbols located in a frontportion of a first slot within a subframe correspond to the controlregion to which a control channel is allocated. A resource regionavailable for PDCCH transmission in the DL subframe is referred to as aPDCCH region hereinafter. The remaining OFDM symbols correspond to thedata region to which a physical DL shared chancel (PDSCH) is allocated.A resource region available for PDSCH transmission in the DL subframe isreferred to as a PDSCH region hereinafter. Examples of DL controlchannels used in 3GPP LTE include a PCFICH, a PDCCH, a PHICH, etc. ThePCFICH is transmitted at a first OFDM symbol of a subframe and carriesinformation regarding the number of OFDM symbols used for transmissionof control channels within the subframe. The PHICH is a response of ULtransmission and carries an HARQ ACK/NACK signal.

Control information carried on the PDCCH is called DCI. The DCI containsresource allocation information and control information for a UE or a UEgroup. For example, the DCI includes a transport format and resourceallocation information of a DL shared channel (DL-SCH), a transportformat and resource allocation information of an UL shared channel(UL-SCH), paging information of a paging channel (PCH), systeminformation on the DL-SCH, information about resource allocation of anupper layer control message such as a random access response transmittedon the PDSCH, a transmit control command set with respect to individualUEs in a UE group, a transmit power control command, information onactivation of a voice over IP (VoIP), DL assignment index (DAI), etc.The transport format and resource allocation information of the DL-SCHare also called DL scheduling information or a DL grant and thetransport format and resource allocation information of the UL-SCH arealso called UL scheduling information or a UL grant. The size andpurpose of DCI carried on a PDCCH depend on DCI format and the sizethereof may be varied according to coding rate. Various formats, forexample, formats 0 and 4 for UL and formats 1, 1A, 1B, 1C, 1D, 2, 2A,2B, 2C, 3 and 3A for DL, have been defined in 3GPP LTE. Controlinformation such as a hopping flag, information on RB allocation,modulation coding scheme (MCS), redundancy version (RV), new dataindicator (NDI), information on transmit power control (TPC), cyclicshift demodulation reference signal (DMRS), UL index, channel qualityinformation (CQI) request, DL assignment index, HARQ process number,transmitted precoding matrix indicator (TPMI), precoding matrixindicator (PMI), etc. is selected and combined based on DCI format andtransmitted to a UE as DCI.

In general, a DCI format for a UE depends on transmission mode (TM) setfor the UE. In other words, only a DCI format corresponding to aspecific TM can be used for a UE configured in the specific TM.

A PDCCH is transmitted on an aggregation of one or several consecutivecontrol channel elements (CCEs). The CCE is a logical allocation unitused to provide the PDCCH with a coding rate based on a state of a radiochannel. The CCE corresponds to a plurality of resource element groups(REGs). For example, a CCE corresponds to 9 REGs and an REG correspondsto 4 REs. 3GPP LTE defines a CCE set in which a PDCCH can be located foreach UE. A CCE set from which a UE can detect a PDCCH thereof is calleda PDCCH search space, simply, search space. An individual resourcethrough which the PDCCH can be transmitted within the search space iscalled a PDCCH candidate. A set of PDCCH candidates to be monitored bythe UE is defined as the search space. In 3GPP LTE/LTE-A, search spacesfor DCI formats may have different sizes and include a dedicated searchspace and a common search space. The dedicated search space is aUE-specific search space and is configured for each UE. The commonsearch space is configured for a plurality of UEs. Aggregation levelsdefining the search space is as follows.

TABLE 3 Number Search Space of PDCCH Aggregation Size candidates TypeLevel L [in CCEs] M^((L)) UE- 1  6 6 specific 2 12 6 4  8 2 8 16 2Common 4 16 4 8 16 2

A PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs according to CCEaggregation level. An eNB transmits a PDCCH (DCI) on an arbitrary PDCCHcandidate in a search space, and a UE monitors the search space todetect the PDCCH (DCI). Here, monitoring refers to attempting to decodeeach PDCCH in the corresponding search space according to all monitoredDCI formats. The UE can detect the PDCCH thereof by monitoring pluralPDCCHs. Since the UE does not know the position in which the PDCCHthereof is transmitted, the UE attempts to decode all PDCCHs of thecorresponding DCI format for each subframe until a PDCCH having the IDthereof is detected. This process is called blind detection (or blinddecoding (BD)).

The eNB can transmit data for a UE or a UE group through the dataregion. Data transmitted through the data region may be called userdata. For transmission of the user data, a PDSCH may be allocated to thedata region. A PCH and a DL-SCH are transmitted through the PDSCH. TheUE can read data transmitted through the PDSCH by decoding controlinformation transmitted through a PDCCH. Information representing a UEor a UE group to which data on the PDSCH is transmitted, how the UE orUE group receives and decodes the PDSCH data, etc. is included in thePDCCH and transmitted. For example, if a specific PDCCH is cyclicredundancy check (CRC)-masked having radio network temporary identify(RNTI) of “A” and information about data transmitted using a radioresource (e.g., frequency position) of “B” and transmission formatinformation (e.g., transport block size, modulation scheme, codinginformation, etc.) of “C” is transmitted through a specific DL subframe,the UE monitors PDCCHs using RNTI information and a UE having the RNTIof “A” detects a PDCCH and receives a PDSCH indicated by “B” and “C”using information about the PDCCH.

A reference signal (RS) to be compared with a data signal is necessaryfor the UE to demodulate a signal received from the eNB. A referencesignal refers to a predetermined signal having a specific waveform,which is transmitted from the eNB to the UE or from the UE to the eNBand known to both the eNB and UE. The reference signal is also called apilot. Reference signals are categorized into a cell-specific RS sharedby all UEs in a cell and a demodulation RS (DM RS) dedicated for aspecific UE. A DM RS transmitted by the eNB for demodulation of DL datafor a specific UE is called a UE-specific RS. Both or one of DM RS andCRS may be transmitted on DL. When only the DM RS is transmitted withoutCRS, an RS for channel measurement needs to be additionally providedbecause the DM RS transmitted using the same precoder as used for datacan be used for demodulation only. For example, in 3GPP LTE(-A), CSI-RScorresponding to an additional RS for measurement is transmitted to theUE such that the UE can measure channel state information. CSI-RS istransmitted in each transmission period corresponding to a plurality ofsubframes based on the fact that channel state variation with time isnot large, unlike CRS transmitted per subframe.

FIG. 4 illustrates an exemplary UL subframe structure used in 3GPPLTE/LTE-A.

Referring to FIG. 4 , a UL subframe can be divided into a control regionand a data region in the frequency domain. One or more PUCCHs can beallocated to the control region to carry UCI. One or more PUSCHs may beallocated to the data region of the UL subframe to carry user data.

In the UL subframe, subcarriers spaced apart from a DC subcarrier areused as the control region. In other words, subcarriers corresponding toboth ends of a UL transmission bandwidth are assigned to UCItransmission. The DC subcarrier is a component remaining unused forsignal transmission and is mapped to the carrier frequency f0 duringfrequency up-conversion. A PUCCH for a UE is allocated to an RB pairbelonging to resources operating at a carrier frequency and RBsbelonging to the RB pair occupy different subcarriers in two slots.Assignment of the PUCCH in this manner is represented as frequencyhopping of an RB pair allocated to the PUCCH at a slot boundary. Whenfrequency hopping is not applied, the RB pair occupies the samesubcarrier.

The PUCCH can be used to transmit the following control information.

-   -   Scheduling Request (SR): This is information used to request a        UL-SCH resource and is transmitted using On-Off Keying (OOK)        scheme    -   HARQ ACK/NACK: This is a response signal to a DL data packet on        a PDSCH and indicates whether the DL data packet has been        successfully received. A 1-bit ACK/NACK signal is transmitted as        a response to a single DL codeword and a 2-bit ACK/NACK signal        is transmitted as a response to two DL codewords. HARQ-ACK        responses include positive ACK (ACK), negative ACK (NACK),        discontinuous transmission (DTX) and NACK/DTX. Here, the term        HARQ-ACK is used interchangeably with the term HARQ ACK/NACK and        ACK/NACK    -   Channel State Information (CSI): This is feedback information        about a DL channel. Feedback information regarding MIMO includes        a rank indicator (RI) and a PMI.

The quantity of control information (UCI) that a UE can transmit througha subframe depends on the number of SC-FDMA symbols available forcontrol information transmission. The SC-FDMA symbols available forcontrol information transmission correspond to SC-FDMA symbols otherthan SC-FDMA symbols of the subframe, which are used for referencesignal transmission. In the case of a subframe in which a soundingreference signal (SRS) is configured, the last SC-FDMA symbol of thesubframe is excluded from the SC-FDMA symbols available for controlinformation transmission. A reference signal is used to detect coherenceof the PUCCH. The PUCCH supports various formats according toinformation transmitted thereon.

Table 4 shows the mapping relationship between PUCCH formats and UCI inLTE/LTE-A.

TABLE 4 Number of bits per PUCCH Modulation subframe, format schemeM_(bit) Usage Etc. 1  N/A N/A SR (Scheduling Request) 1a BPSK  1ACK/NACK or One SR + ACK/NACK codeword 1b QPSK  2 ACK/NACK or Two SR +ACK/NACK codeword 2  QPSK 20 CQI/PMI/RI Joint coding ACK/NACK (extendedCP) 2a   QPSK + 21 CQI/PMI/RI + Normal BPSK ACK/NACK CP only 2b   QPSK +22 CQI/PMI/RI + Normal QPSK ACK/NACK CP only 3  QPSK 48 ACK/NACK or SR +ACK/NACK or CQI/PMI/RI + ACK/NACK

Referring to Table 4, PUCCH formats 1/1a/1b are used to transmitACK/NACK information, PUCCH format 2/2a/2b are used to carry CSI such asCQI/PMI/RI and PUCCH format 3 is used to transmit ACK/NACK information.

Reference Signal (RS)

When a packet is transmitted in a wireless communication system, signaldistortion may occur during transmission since the packet is transmittedthrough a radio channel. To correctly receive a distorted signal at areceiver, the distorted signal needs to be corrected using channelinformation. To detect channel information, a signal known to both atransmitter and the receiver is transmitted and channel information isdetected with a degree of distortion of the signal when the signal isreceived through a channel. This signal is called a pilot signal or areference signal.

When data is transmitted/received using multiple antennas, the receivercan receive a correct signal only when the receiver is aware of achannel state between each transmit antenna and each receive antenna.Accordingly, a reference signal needs to be provided per transmitantenna, more specifically, per antenna port.

Reference signals can be classified into an UL reference signal and a DLreference signal. In LTE, the UL reference signal includes:

i) a DMRS for channel estimation for coherent demodulation ofinformation transmitted through a PUSCH and a PUCCH; and

ii) an SRS used for an eNB to measure UL channel quality at a frequencyof a different network.

The DL reference signal includes:

i) a cell-specific reference signal (CRS) shared by all UEs in a cell;

ii) a UE-specific reference signal for a specific UE only;

iii) a DMRS transmitted for coherent demodulation when a PDSCH istransmitted;

iv) a CSI-RS for delivering CSI when a DL DMRS is transmitted;

v) a multimedia broadcast single frequency network (MBSFN) referencesignal transmitted for coherent demodulation of a signal transmitted inMBSFN mode; and

vi) a positioning reference signal used to estimate geographic positioninformation of a UE.

RSs can be classified into an RS for channel information acquisition andan RS for data demodulation. The former needs to be transmitted in awide band as it is used for a UE to acquire channel information on DLtransmission and received by a UE even if the UE does not receive DLdata in a specific subframe. This RS is used even in a handoversituation. The latter is transmitted along with a corresponding resourceby an eNB when the eNB transmits a DL signal and is used for a UE todemodulate data through channel measurement. This RS needs to betransmitted in a region in which data is transmitted.

To satisfy a reduction in the above-described latency, i.e., lowlatency, a TTI, which is a minimum unit for data transmission, needs tobe newly designed to be reduced to a shortened TTI (sTTI) which is equalto or less than 0.5 msec (ms). For example, as illustrated in FIG. 5 ,in order to reduce user-plane (U-plane) latency to 1 ms until the UEcompletes transmission of ACK/NACK (A/N) since the eNB has startedtransmission of data (a PDCCH and a PDSCH), the sTTI may be configuredin units of about 3 OFDM symbols.

In a DL environment, a PDCCH for data transmission/scheduling within thesTTI (i.e., a sPDCCH) and a PDSCH for transmitting data within the sTTI(i.e., a sPDSCH) may be transmitted. For example, as illustrated in FIG.6 , a plurality of sTTIs may be configured using different OFDM symbolsin one subframe. Characteristically, OFDM symbols in which legacychannels are transmitted may be excluded from OFDM symbols constitutingan sTTI. The sPDCCH and the sPDSCH within the sTTI may be transmitted indifferent OFDM symbol regions by being time-division-multiplexed (TDMed)or may be transmitted in different PRBs or on different frequencyresources by being frequency-division-multiplexed (FDMed).

As in the above-described DL environment, data may betransmitted/scheduled within an sTTI in a UL environment, and thecounterparts of the TTI-based legacy PUCCH and PUSCH are referred to assPUCCH and sPUSCH, respectively.

In the present disclosure, a description is given based on an LTE/LTE-Asystem. In a legacy LTE/LTE-A system, a 1-ms subframe may include 14OFDM symbols in the case of a normal CP. If the 1-ms subframe isconfigured by TTIs shorter than 1 ms, one subframe may include aplurality of TTIs. As in examples illustrated in FIGS. 7A to 7D, 2symbols, 3 symbols, 4 symbols, or 7 symbols may constitute one TTI.Although not illustrated, the case in which one symbol constitutes oneTTI may be considered. If one symbol constitutes one TTI unit, 12 TTIsare generated under the assumption that legacy PDCCHs are transmitted intwo OFDM symbols. Similarly, as illustrated in FIG. 7A, if two symbolsconstitute one TTI unit, 6 TTIs may be generated. As illustrated in FIG.7B, if 3 symbols constitute one TTI unit, 4 TTIs may be generated. Asillustrated in FIG. 7C, if 4 symbols constitute one TTI unit, 3 TTIs maybe generated. In this case, it is assumed that legacy PDCCHs aretransmitted in the first starting two OFDM symbols.

As illustrated in FIG. 7D, in the case in which 7 symbols constitute oneTTI, 7 symbols including legacy PDCCHs may constitute one TTI and 7subsequent symbols may constitute one TTI. If one TTI includes 7symbols, a UE supporting an sTTI assumes that, in a TTI located at afront part of one subframe (i.e., the first slot), front two OFDMsymbols in which legacy PDCCHs are transmitted are punctured orrate-matched and that data of the UE and/or control information istransmitted in 5 symbols subsequent to the front two symbols. Incontrast, the UE assumes that, in a TTI located at a rear part of onesubframe (i.e., the second slot), data and/control information may betransmitted in all of 7 symbols without a punctured or rate-matchedresource region.

The present disclosure considers an sTTI structure in which an sTTIincluding 2 OFDM symbols (hereinafter, OFDM symbols are referred to as“OSs”) and an sTTI including 3 OSs are mixed in one subframe asillustrated in FIGS. 8A and 8B. In this way, an sTTI including 2 OSs or3 OSs may be simply defined as 2-symbol sTTI (i.e., a 2-OS sTTI).Further, a 2-symbol sTTI or a 3-symbol sTTI may be referred to simply asa 2-symbol TTI or a 3-symbol TTI, all of which are apparently TTIsshorter than the legacy 1-ms TTI based on which the present disclosureis. That is, when “TTI” is mentioned herein, this also covers an sTTI,and the present disclosure relates to a communication scheme in a systemconfigured with a shorter TTI than the legacy TTI, regardless of theappellation.

In the present disclosure, a numerology refers to determining a TTIlength or subcarrier spacing to be applied to a wireless communicationsystem, a parameter such as a predetermined TTI length or subcarrierspacing, or a communication structure or system based on the parameter.

In a <3,2,2,2,2,3> sTTI pattern illustrated in FIG. 8A, an sPDCCH may betransmitted according to the number of symbols of a PDCCH. In a<2,3,2,2,2,3> sTTI pattern illustrated in FIG. 8B, it may be difficultto transmit the sPDCCH due to a legacy PDCCH region.

New Radio Technology (NR)

While the structure, operation, or function of the 3GPP LTE(-A) systemhas been described above, the structure, operation, or function of the3GPP LTE(-A) system may be slightly modified or implemented in otherways in NR. Some of the modifications and implementations will bebriefly described.

NR supports various numerologies. For example, a subcarrier spacing ofup to a 2^(n) multiple of 15 KHz (n=1, 2, 3, 4) as well as a subcarrierspacing of 15 KHz is supported.

Further, in the case of a normal CP, although the number of OFDM symbols(hereinafter, simply referred to as “symbols”) per slot is fixed to 14,the supported number of slots in one subframe is up to 2^(k) (k=0, 1, 2,3, 4, and 5) and a radio frame includes 10 subframes as in the legacyLTE system. In the case of an extended CP, the number of symbols perslot is fixed to 12, and one subframe includes 4 slots. Further, one RBis defined by 12 consecutive subcarriers in the frequency domain, as inthe legacy LTE system.

Further, the use (e.g., DL, UL, or flexible) of each symbol in one slotmay be defined according to a slot format, and both a DL symbol and a ULsymbol may be configured in one slot. This case is referred to as aself-contained subframe (or slot) structure.

The next-generation system seeks to use a wide frequency band andsupport various services or requirements. For example, in regard to the3GPP NR requirements, one of representative scenarios, ultra-reliableand low latency communications (URLLC) has the requirements of lowlatency and high reliability with a user-plane latency of 0.5 ms andtransmission of X-byte data in 1 ms at or below an error rate of10{circumflex over ( )}−5. While enhanced mobile broadband (eMBB)generally has a large traffic capacity, URLLC traffic ranges from tensof bytes to hundreds of bytes in file size and occurs sporadically.Accordingly, transmission that maximizes a transmission rate andminimizes the overhead of control information is required in eMBB, and areliable transmission scheme with a short scheduling time unit isrequired in URLLC.

Different reference time units may be assumed/used in transmitting andreceiving a physical channel depending on applications or traffic types.A reference time unit may refer to a basic unit of scheduling a specificphysical channel, and a different reference time unit may be configuredaccording to the number of symbols and/or a subcarrier spacing in thescheduling unit. For the convenience of description, embodiments of thepresent disclosure will be described in the context of a slot and amini-slot as reference time units. A slot may be a basic scheduling unitused, for example, for general data traffic (e.g., eMBB). A mini-slot,which lasts less than a slot in the time domain, may be a basicscheduling unit used for more special-purpose traffic or communicationscheme (e.g., URLLC, an unlicensed band, or millimeter wave). However,this is a mere embodiment, and obviously, the present disclosure may beextended to the case in which a physical channel is transmitted andreceived at a mini-slot level in eMBB or at a slot level in URLLC oranother communication scheme.

A component carrier (CC) proposed in the present disclosure may bereplaced with a bandwidth part (BWP) configured for a UE. A similarmethod may be applied, when multiple BWPs within one wideband carrierare configured for a UE. That is, the terms CC and BWP areinterchangeably used in the disclosure. This implies that a CC may bereplaced with a carrier from the perspective of a UE, not from theperspective of a network. Accordingly, the present disclosure is alsoapplicable, when a UE is configured with multiple active BWPs within onenetwork carrier in view of different numerologies.

Ultra-Reliable Transmission Using Diversity Schemes

Segmentation or Segmented Transmissions

In order to satisfy the requirements of low latency and high reliabilityfor URLLC traffic, it may be regulated that a specific transport block(TB)/code block (CB)/CB group (CBG) is transmitted across a plurality ofcomponent carriers (CCs)/transmission and reception points (TRP).Specifically, after the TB/CBG/CB is divided into several segments, thesegments may be distributed and transmitted in the plurality ofCCs/TRPs, respectively, or the TB/CBG/CB may be repeatedly mapped to andtransmitted in the plurality of CCs/TRPs.

Specifically, the TB/CBG/CB is mapped to the plurality of CCs/TRPs inthe following methods.

Alt 1: One TB is repeated/copied and mapped to the plurality ofCCs/TRPs.

Alt 2: One TB is mapped to the plurality of CCs/TRPs, with a pluralityof respective CBGs in the TB distributed and mapped to the CCs/TRPs.

Alt 3: One CBG is repeated/copied and mapped to the plurality ofCCs/TRPs.

Alt 4: One CBG is mapped to the plurality of CCs/TRPs, with a pluralityof respective CBs in the CBG distributed and mapped to the CCs/TRPs.

Alt 5: One CB is repeated/copied and mapped to the plurality ofCCs/TRPs.

Alt 6: One or more codewords may be transmitted, with each of thecodewords mapped to one CC/TRP. Multiple codewords may be scheduled byone DCI. When this method is used, one codeword may be mapped to one ormore CCs/TRPs in consideration of the presence of more carriers or TRPsthan the codewords. Further, one or two codewords may be mapped to theentire CCs/TRPs. In this case, it is assumed that information schedulingthe corresponding codeword is carried in one DCI. Alternatively,although separate DCI is possible, a relationship between codewords maybe previously specified.

Alt 7: One TB is mapped to the plurality of CCs/TRPs. In this case, anRB set accessible for resource allocation may be scheduled by logicallyconcatenating resources of the CCs/TRPs. For example, when two carriersare 100 RBs and 50 RBs, respectively, the entire resource allocation maybe performed for 150 RBs. An RBG size per carrier/TRP may be setdifferently. Assume that the corresponding TB is scheduled by one DCI.

Information about the CCs/TRPs to which the TB/CBG/CB is mapped may beindicated by a physical-layer signal (e.g., DCI) that schedules theTB/CBG/CB. When the TB/CBG/CB is scheduled by DCI, the index of atransmission CC/TRP may be set separately for each TB, CBG, or CB, thenumber of CCs/TRPs may be configured and the CCs/TRPs may be distributedaccording to a specific rule, or when a specific field is configured,the CCs/TRPs may be distributed across all active carriers.Characteristically, the information about the CCs/TRPs to which theTB/CBG/CB is mapped may be indicated by a group-common PDCCH or anindividual DCI (DCI including a resource assignment for each TB/CBG/CB).Alternatively, the information about the CCs/TRPs to which the TB/CBG/CBis mapped may be configured by a higher-layer signal or pre-agreed. Forexample, the information about the CCs/TRPs to which the TB/CBG/CB ismapped may be determined by a function of the index of a scheduling celland/or the index of a scheduled cell. More specifically, CCs to which aspecific TB/CBG/CB is to be mapped may be pre-agreed to be X cellsincluding a scheduled cell in an ascending order of cell indexes.

The information about the CCs to which the TB/CBG/CB is to be mappedincludes cell indexes (or a combination index indicating cellinformation for a plurality of cells) and/or the number of cells towhich the CB/CBG is to be mapped and/or information about a part of thecells to which the CB/CBG is to be mapped (e.g., the lowest/highest cellindex).

Whether the operation of transmitting a TB/CBG/CB over a plurality ofCCs/TRPs is enabled or not may be configured for the UE by ahigher-layer signal or may be indicated by a physical-layer signal.Characteristically, a specific field of DCI may indicate whether theoperation of transmitting a TB/CBG/CB in a plurality of CCs/TRPs isenabled or not, or the UE may assume the difference by distinguishingbetween search spaces, between scramblings, between RNTIs, or between agrant received before A/N transmission and a grant which is not receivedbefore the A/N transmission. Alternatively, the operation may beindicated by a group-common PDCCH. Alternatively, the operation isautomatically enabled for a channel scheduled in a specific schedulingunit. For example, it may be regulated that the operation oftransmitting a TB/CBG/CB over a plurality of CCs/TRPs is performed for achannel scheduled in a mini-slot. In the case where the operation istriggered, when information about CCs/TRPs is received in DCI, the sizeof the DCI may be different, compared to transmission in a singlecarrier/TRP, thereby increasing the number of blind decodings of the UE.Thus, for example, when a CBG is transmitted over multiple CCs/TRPs, thefollowing scheme may be considered.

-   -   The UE is configured to initially transmit and/or retransmit a        CBG in each CC/TRP.    -   DCI is transmitted separately for each CC/TRP (cross-carrier        scheduling may be performed by the DCI), and thus only a        scheduled CBG is transmitted in each carrier. For example, when        even-numbered/odd-numbered CBGs are transmitted over 2 CCs, DCI1        that schedules an even-numbered CBG is transmitted in CC1 and        DCI2 that schedules an odd-numbered CBG is transmitted in CC2.    -   In the case of an initial transmission, when each CBG is        partially transmitted, an indication of a total transport block        size (TBS) may be required. This information may be transmitted        in a CC/TRP corresponding to the lowest cell index among the        transmitted CCs/TRPs. Alternatively, RA- or TBS-related        information (e.g., the number of RBs+a scaling factor) may be        additionally transmitted to infer the TBS.

Retransmission Scheme when Segmentation or Repeated Transmission isSupported

Retransmission operations are proposed for the case where the specificTB/CBG/CB is transmitted across a plurality of CCs/TRPs.

Alt 1: A retransmission is performed by applying the same TB/CBG/CBmapping as that used in a previous transmission. That is, the CCs/TRPsin which the retransmission is performed may not be changed.

Alt 2: It may be regulated that in a retransmission, the TB/CBG/CB maybe mapped to different CCs/TRPs from those in a previous transmission.Characteristically, in the retransmission, the TB/CBG/CB may be mappedto the same number of different CCs/TRPs as the CCs/TRPs used in theprevious transmission, or the CCs/TRPs in the retransmission may be asubset of the CCs/TRPs used in the previous transmission. This may beintended to ensure reliability by causing the TB/CBG/CB to experiencedifferent channels if decoding of the previous transmission fails.Specifically, it may be regulated that information on the CCs/TRPs towhich the TB/CBG/CB is mapped in the retransmission is indicated byretransmission scheduling DCI. Alternatively, the information may beconfigured UE-specifically by a higher-layer signal. For example, arelationship (e.g., an offset) between the CCs/TRPs to which theTB/CBG/CB is to be mapped in the retransmission and the CCs/TRPs towhich the TB/CBG/CB was mapped in the initial transmission may beconfigured for the UE by a higher-layer signal.

Alt 3: It may be regulated that a retransmission is performed based on aCC/TRP in which an HARQ-ACK for the TB/CBG/CB is ACK. For example, whenCBGs 1, 2, and 3 are mapped to and transmitted in CCs 1, 2, and 3,respectively, and HARQ-ACKs for the CBGs are (A, N, A), a retransmissionfor CBG 2 is repeated/copied over CCs 1 and 3, or CBG2 is split into twosegments and transmitted in CCs 1 and 3.

Alt 4: A transmission operation needs to be defined for the case whereanother channel is transmitted or scheduled in a CC/TRP to which aTB/CBG/CB is to be mapped at a retransmission. In this case, it may beregulated that the TB/CBG/CB corresponding to the retransmission ismapped to only the remaining CC/TRPs except the CC/TRP.Characteristically, this may be applied when a TB/CBG/CB isrepeated/copied and mapped to a plurality of CCs/TRPs. Alternatively,whether or not the CC/TRP is mapped may be determined according topriority with other channels. For example, in the case of collision withan initial transmission channel, it may be regulated that the initialtransmission channel is dropped and the retransmission TB/CBG/CB ismapped to the CC/TRP with priority. In another example, the prioritiesof scheduling units may be considered. In the case of collision with amini-slot-based initial transmission channel, the retransmissionTB/CBG/CB is not mapped to the corresponding CC/TRP, and the initialtransmission channel is transmitted with priority.

CRC Configuration

When the specific TB/CBG/CB is transmitted across a plurality ofCCs/TRPs, a CRC may be included on a CC/TRP basis. Specifically, a CRCmay be included on a CC/TRP basis in the specific TB/CBG/CBrepeated/copied and mapped to the plurality of CCs/TRPs.

Maximum TBS Determination Method

When the above-described method is used, a maximum TBS may be determinedin the following methods.

Alt 1: A maximum schedulable TBS may be set to the minimum or maximum ofTBSs that each CC/TRP may handle.

Alt 2: A maximum schedulable TBS may be set to the sum of TBSs that eachCC/TRP may handle, and characteristically, the sum of the CCs/TRPs towhich data is mapped.

HARQ Process Determination Method

When the above-described method is used, an HARQ process may bedetermined in the following methods.

Alt 1: An HARQ process used for the method is separately configured. TheHARQ process is not available in every CC/TRP and is reserved for theoperation.

Alt 2: A main CC/TRP is determined from among multiple CCs, andtransmission is assumed to be in an HARQ process of the CC/TRP. Whenthis method is used, HARQ-ACK transmission and retransmission may alsobe performed in the main CC/TRP.

Alt 3: It is assumed that a specified HARQ process is used for eachCC/TRP.

Alt 4: When multiple codewords or TBs are mapped to each CC/TRP, it maybe assumed that the HARQ process ID is sequentially increased accordingto the cell ID index. This means that a scheme in which a CC is assumedto be transmitted through mapping similar to that in a method oftransmitting a CC in a plurality of subframes/slots in the time domainmay be applied.

Method Using Soft Buffer

Alt 1: A soft buffer may be allocated separately from a soft bufferallocated to a CC/TRP.

Alt 2: A main CC/TRP may be determined from among multiple CCs/TRPs, anda soft buffer of the CC/TRP may be used.

Alt 3: A different soft buffer configuration is applied according to aTB mapping method. For example, when a TB is mapped to multipleCCs/TRPs, the soft buffer may be divided into soft buffers of therespective CCs.

Overall Behavior on UL Repetition

For the convenience of description, a method of repeatedly transmittingthe same information/channel in a plurality of CCs and/or BWPs isreferred to as frequency-domain repetition, a method of repeatedlytransmitting the same information/channel in a plurality of TTIs isreferred to as time-domain repetition, and a method of repeatedlytransmitting the same information/channel in a plurality of layers isreferred to as space-domain repetition. Similarly, a method ofsegmenting and transmitting the same information/channel in a pluralityof CCs and/or BWPs is referred to as frequency-domain segmentation, amethod of segmenting and transmitting the same information/channel in aplurality of TTIs is referred to as time-domain segmentation, and amethod of segmenting and transmitting the same information/channel in aplurality of layers is referred to as space-domain segmentation.

Depending on the power allocation state of the UE, therepetition/segmentation behavior may be determined differently.Characteristically, for a UE placed in a non-power-limited situation,frequency-domain repetition/segmentation and/or space-domainrepetition/segmentation is configured, whereas for a UE placed in apower-limited situation, time-domain repetition/segmentation and/or norepetition/segmentation is configured. The power-limited situation meansthat the total transmission power of the UE exceeds a maximumtransmission power of the UE, and otherwise, the situation is anon-power-limited situation.

This is because in the power-limited situation, even though informationis repeatedly loaded in CCs or in the space domain, power needs to bedivided and thus the improvement of transmission performance may benegligibly slight. It may be regulated that for a UE in anon-power-limited situation, a repetition/segmentation operation in aspecific domain is enabled, while for a UE in a power-limited situation,the repetition/segmentation operation is disabled.

Alternatively, the UE may adjust the degree of repetition/segmentationso as not to be placed in a power-limited situation. Characteristically,it may be regulated that the UE determines the number of CCs and/or BWPsand/or layers and/or TTIs, for repetition/segmentation, in order not tobe placed in a power-limited situation. This overrides a numberpreviously configured (by a higher-layer signal or DCI), and the UEperforms repetition/segmentation only by the number of CCs and/or BWPsand/or layers and/or TTIs determined in the rule. Morecharacteristically, (a set of) candidate numbers of CCs and/or BWPsand/or layers and/or TTIs, for repetition/segmentation are predefined orsignaled, among which a maximum number of CCs and/or BWPs and/or layersand/or TTIs, which prevents the UE from being placed in a power-limitedsituation, may be selected as one of the candidates (in the set).

Alternatively, a different repetition/segmentation operation may beconfigured according to a waveform used for the UL of the UE. Forexample, when OFDM is used for the UL, transmission may be performed innon-contiguous frequencies, and thus frequency diversity is sought inone CC. However, when SC-OFDM is used for the UE, transmission may beperformed across two CCs by using different RFs.

Alternatively, a different repetition/segmentation operation may beconfigured according to a target service and/or a quality of service(QoS) and/or a block error rate (BLER) requirement. For example,time-domain repetition/segmentation may be configured for atransmission/channel requiring high reliability, whereasfrequency-domain repetition/segmentation and/or space-domainrepetition/segmentation may be configured for a transmissions/channelrequiring low latency.

For example, it may be regulated that repetition/segmentation is notapplied to an HARQ-ACK for a PDSCH corresponding to eMBB, andrepetition/segmentation is applied to an HARQ-ACK for a PDSCHcorresponding to URLLC. Alternatively, for the case of receiving slot ormulti-slot scheduling and the case of mini-slot or multi-mini-slotscheduling, repetition numbers, whether repetition/segmentation is to beapplied, or BLER targets of HARQ-ACK transmission may be configured tobe different. If HARQ-ACKs for two schedulings or different QoS data arebundled/multiplexed, the BLER target may follow the highest one, mayfollow the attributes of a first PDSCH, or may not allowbundling/multiplexing between different HARQ-ACKs.

Alternatively, which repetition/segmentation operation among the aboverepetition/segmentation operations (which may include a repetitionnumber) (characteristically, applied for a specific channel) is enabledmay be configured for to the UE by a higher-layer signal, or indicatedto the UE by DCI. In a characteristic example, which one of the aboverepeat/segmentation operations is enabled may be indicated bygroup-common DCI or first-DCI of two-level DCI. More particularly, therepetition/segmentation operation (e.g., time-domainrepetition/segmentation, frequency-domain repetition/segmentation,space-domain repetition/segmentation) may be indicated to the UE by theeNB (by higher-layer signaling and/or group-common DCI and/or thirdDCI). And/or the repetition/segmentation operation may be determinedbased on a specific power level or range (as indicated by the eNB).

More specifically, in the case of a PUSCH transmission, a differentMCS/repetition number is configured for each bearer. Therefore, thePUSCH transmission is based on a higher-layer configuration orinformation configured in a UL grant. When a transmission is performedwithout a UL grant, like a grant-free transmission, it may be assumedthat particularly a higher-layer configuration is followed. In addition,for a CSI transmission, it may be assumed that corresponding informationis transmitted together in the configuration in the case of periodicCSI. When aperiodic CSI is triggered by DCI, information about arepetition/segmentation operation (e.g., a repetition/segmentationmethod and a repetition number) or a BLER target or transport channel(when it is assumed that the target BLER is different for each transportchannel) may be indicated. In addition, in the case of HARQ-ACK, it mayalso be assumed that corresponding information is transmitted togetherin the configuration. When aperiodic CSI is triggered by DL schedulingDCI, information about a repetition/segmentation operation (e.g., arepetition/segmentation method and a repetition number) or a BLER targetor transport channel (when it is assumed that the target BLER, AN error,and NA error are different for each transport channel) may be indicated.

Alternatively, whether repetition/segmentation for a specific channel isenabled may be configured for the UE by a higher-layer signal orindicated to the UE by DCI. In a characteristic example, whetherrepetition/segmentation for the particular channel is enabled may beindicated to the UE by group-common DCI or the first-DCI of two-levelDCI.

It may be regulated that a UE capability is reported in relation to therepetition/segmentation operation. Characteristically, among time-domainrepetition/segmentation, frequency-domain repetition/segmentation,space-domain repetition/segmentation, or a combination of all/some ofthem one or more repetition/segmentation operations supported by the UEmay be reported to the network. Such a capability may vary depending ona scheduling unit supported by the UE, or may vary according to afrequency band, a frequency band combination, or a frequency range.

Reliable UCI Transmission

A CC and/or a BWP to which UCI is piggybacked may be determinedaccording to a target service and/or a QoS and/or a BLERrequirement/target BLER of the UCI. Specifically, when the UCI is anHARQ-ACK, a target service and/or a QoS and/or a BLER requirement of aPDSCH corresponding to the HARQ-ACK may be included (this is assumed tobe determined in the manner described in the foregoing section “OverallBehavior on UL Repetition”). If the UCI is CSI, a CC and/or a BWP towhich the UCI is to be piggybacked may be determined differently foreach target BLER of the CSI. That is, UCI may be grouped by targetservice and/or QoS and/or BLER requirement and transmitted on a channelcorresponding to the same target service and/or QoS and/or BLERrequirement. For example, CSI having a target BLER of 10{circumflex over( )}−2 may be transmitted on a PUSCH having a BLER requirement of10{circumflex over ( )}−2, and CSI having a target BLER of 10{circumflexover ( )}−5 may be transmitted on a PUSCH having a BLER requirement of10{circumflex over ( )}−5.

A specific UE may be configured with a plurality of CSI processes ormodes by an eNB, and a target BLER, and/or a reference resource and/or aBLER requirement and/or CSI configuration information and/or a CSIfeedback transmission method may be configured independently for eachCSI process or mode.

Alternatively, UCI may be mapped to a PUSCH differently for each targetservice and/or QoS and/or BLER requirement and/or target BLER of theUCI. For example, it may be regulated that UCI with a high BLERrequirement is mapped to a symbol closer to a DMRS. This may mean thatonly when two different types of UCI having different reliabilityrequirements are multiplexed and mapped to one PUSCH, different mappingmay be used between the two types of UCI. Alternatively, differentmapping may always be assumed to reduce ambiguity between the case and acase of transmitting UCI for one QoS.

Further, when the target BLER of ae transmission PUSCH and the targetBLER of UCI are different, a transmitted DMRS pattern may be configuredto follow the higher of the target BLERs. For example, a higher-densityDMRS pattern is needed for a higher BLER, and when the target BLER ofthe UCI is higher than the BLER of the PUSCH, the DMRS pattern may be aDMRS pattern required for the UCI. This DMRS pattern configuration maybe selected by the UE or configured by a higher-layer signal and/or DCI.

Alternatively, a different coding rate and/or the presence or absence ofa CRC may be applied for each target service and/or QoS and/or BLERrequirement and/or target BLER of the UCI. For example, when the targetBLER of the UCI is low, the CRC of a channel carrying the UCI may beomitted. When the target BLER of the UCI is high, the CRC of the channelcarrying the UCI may be added. The above description is applicable evenwhen the UCI is piggybacked to the PUSCH, but may also be applied whenthe UCI is transmitted on one channel (e.g., PUCCH).

Alternatively, a different resource allocation may be configured for aUCI transmission channel for each target service and/or QoS and/or BLERrequirement and/or target BLER of the UCI. For example, an offset usedin configuring a resource for use in transmitting UCI may beindependently configured for each target service and/or QoS and/or BLERrequirements and/or target BLER.

Alternatively, when the UCI transmission channel is a PUCCH, a differentchannel format and/or type may be determined/selected for each targetservice and/or QoS and/or BLER requirement and/or target BLER of theUCI. For example, when the target BLER of the UCI is low, the UCI may bebased on PUCCH format 2, and when the target BLER of UCI is high, a newPUCCH format may be used and this PUCCH format may be transmitteddifferently by time-domain and/or frequency-domain and/or carrier-domaindiversity based on a Reed-Muller (RM) code with a CRC added.

Alternatively, a different TTI length and/or numerology (e.g.,subcarrier spacing) and/or duration may be determined/selected for a UCItransmission channel, for each target service and/or QoS and/or BLERrequirement and/or target BLER of UCI. For example, in the case of anHARQ-ACK for a channel that targets high reliability, the correspondingUCI is transmitted on a channel (e.g., a long PUCCH) with a relativelylong TTI length or duration. In the case of an HARQ-ACK for a channeltargeting low latency, it may be regulated that the UCI is transmittedon a channel (e.g., short PUCCH) with a relatively short TTI length orduration.

This selection (e.g., PUCCH format selection and/or UCI mapping schemeselection and/or inclusion or non-inclusion of a CRC and/or resourceallocation and/or TTI length and/or numerology and/or channel duration,etc.) may be indicated dynamically by DCI or determined according to thecontent of the UCI (e.g., if CSI is a feedback for a high target BLER ora feedback for a low target BLER). In the case of an A/N, the A/N may bemapped to a bearer carrying a PDSCH. Alternatively, the QoS of the A/Nmay be indicated by DCI. Alternatively, as scheduling for each PDSCH maybe distinguished by a QoS, the QoS of an A/N may also be determinedaccording to each QoS, and such mapping may be configured by a highlayer or implicit mapping may be assumed.

Frequency-Domain Repetition for UCI

In order to increase the reliability of a UCI transmission, repeatedtransmissions of UCI in a plurality of CCs and/or BWPs, that is,frequency-domain repetition/segmentation may be considered. By PUSCHscheduling, it may be determined how frequency-domainrepetition/segmentation of the UCI transmission is to be applied.

Characteristically, the frequency-domain repetition/segmentation of theUCI transmission may be determined by the number of RBs (or the amountof allocated resources) of the PUSCH scheduled in each CC and/or BWP. Inone method, the frequency-domain repetition/segmentation of the UCItransmission may be applied only to CCs and/or BWPs scheduled over apredetermined number of RBs or more RBs. In this case, the referencenumber of RBs may be configured by a higher-layer signal or indicated byDCI. Particularly, a different reference number of RBs may beconfigured/indicated according to a system bandwidth.

In another method, it may be regulated that UCI is piggybacked andtransmitted with priority to a CC and/or BWP having a relatively largenumber of RBs. The number of CCs and/or BWPs in which actual UCI will betransmitted may be configured by a higher-layer signal or indicated byDCI. Particularly, a different number of CCs and/or BWPs may beconfigured/indicated according to a system bandwidth.

More generally, irrespective of PUSCH scheduling, the number/indexes ofCCs and/or BWPs subjected to frequency-domain repetition/segmentation ofparticular UCI may be configured by a higher-layer signal or indicatedby DCI. Particularly, a different number/indexes of CCs and/or BWPs maybe configured/indicated according to a system bandwidth.

Alternatively, it may be regulated characteristically that UCI istransmitted in a different number/different indexes of CCs and/or BWPsaccording to the type of the UCI. For example, it may be regulated thatan HARQ-ACK is repeatedly piggybacked in 5 cells, starting from thelowest cell index among PUSCH scheduled cells, and CSI is repeatedlypiggybacked in the remaining cells. In this case, information about thenumber/indexes of cells to be piggybacked for each UCI type may bepredefined, configured by a higher-later signal, or indicated by DCI.More characteristically, when UCI is piggybacked to a different cellaccording to the type of the UCI, a different UCI mapping rule from thelegacy mapping rule may be applied such that an RI is mapped to a symbolclosest to a DMRS (similar to HARQ-ACK mapping in the LTE standard), anda CQI/PMI is mapped to a symbol second-closest to the DMRS (similar toRI mapping in the LTE standard). This mapping may help to furtherimprove the transmission reliability of UCI.

An exception rule may be defined such that UCI is not actuallytransmitted in among the “CCs in which UCI is transmitted” determined bythe rule, under a specific condition. Characteristically, it may beregulated that UCI is not actually loaded in a CC and/or a BWP in whicha (predefined or signaled) TTI length and/or numerology isused/scheduled.

PUCCH Repetition/Segmentation in Frequency Domain Using SCell

In order to obtain frequency diversity even during transmission of UCIon a PUCCH, frequency-domain repetition/segmentation may be performed.Although the PUCCH is generally transmitted in a CC configured as aPCell, it may be regulated that the PUCCH is also transmitted in anSCell through repetition or segmentation, for frequency diversity. Sincethis operation may not always be desirable in terms of power allocationor scheduling, whether the frequency-domain repetition/segmentationoperation for the PUCCH in the SCell is activated/deactivated orenabled/disabled may be configured by a higher-layer signal or indicatedby DCI. In addition, which CC and/or BWP is subjected to thefrequency-domain repetition/segmentation operation for the PUCCH may beconfigured by a higher-layer signal or indicated by DCI. Morecharacteristically, the DCI may be scheduling DCI, and whether toprovide the indication by DCI or a higher-layer signal may be differentaccording to the type of the UCI.

During the frequency-domain repetition/segmentation operation for thePUCCH, a resource in which the PUCCH is to be transmitted may beimplicitly determined in each CC and/or BWP. In one example, the PUCCHmay be transmitted in the same PUCCH resource indicated by DCI in CCsand/or BWPs in which the PUCCH is to be repeated. In another example, aresource offset may be configured for each CC and/or BWP by ahigher-layer signal, and final PUCCH resources may be determined byapplying the offsets set for the respective CCs and/or BWPs from a PUCCHresource indicated by DCI. In another example, DCI may include aplurality of ACK/NACK resource indicators (ARIs), each of which mayindicate a PUCCH resource of each CC (set) and/or BWP (set). Theindication method may be generally extended to a case in which a PUCCHis transmitted through repetition or segmentation in the time/spacedomain (or any other domain).

It may be regulated that during the frequency-domainrepetition/segmentation operation for the PUCCH, a PUSCH is transmittedwith priority in CC(s) in which the PUSCH is scheduled, while thetransmission of the PUCCH is dropped. In other words, it may beregulated that the frequency-domain repetition/segmentation operationfor the PUCCH is performed only for CCs (SCells) and/or BWPs in whichthe PUSCH is not scheduled. Alternatively, it may be regulated thatduring the frequency-domain repetition/segmentation operation for thePUCCH, the scheduled PUSCH is dropped and the PUCCH is transmitted in apart of the CC(s) scheduled for the PUSCH, while the scheduled PUSCH istransmitted only in the remaining CC(s). In this case, information aboutthe number/indexes of CCs and/or BWPs in which frequency-domainrepetition/segmentation of a PUCCH has priority over PUSCH scheduling(or PUSCH scheduling has priority over frequency-domainrepetition/segmentation of a PUCCH) may be configured by a higher-layersignal or indicated by DCI.

It may be regulated that when the frequency-domainrepetition/segmentation operation for the PUCCH is enabled, a UE whichis not capable of/is not configured with simultaneous PUCCH/PUSCHtransmission piggybacks the entire UCI or partial (of a high priority)to PUSCH(s)m while dropping the PUCCH transmission in all CCs. Inanother method, it may be regulated that the UCI is transmitted throughfrequency-domain repetition/segmentation of the PUCCH in the PCell andother SCell(s), while the entire PUSCH is dropped. Which one between theabove two operations is to be performed by the UE may be configured by ahigher-layer signal or indicated by DCI.

For a UE capable of/configured with simultaneous PUCCH/PUSCHtransmission, the following priority may be considered in powerallocation.

Alt 1: PUCCH on PCell>PUCCH on SCell(s)>PUSCH with UCI>PUSCH without UCI

Alt 2: PUCCH on PCell>PUSCH with UCI>PUCCH on SCell(s)>PUSCH without UCI

It may be regulated that in a power-limited situation, the UE performspower reduction and/or drop on channels in an ascending order ofpriority in the above prioritization. It may be regulated that power isscaled down equally across all or a part of the channels, for powerreduction.

Carrier/BP Selection

In a method of achieving frequency diversity in PUCCH/PUSCHtransmission, it may be regulated that a CC and/or a BWP in which thePUCCH/PUSCH is transmitted is dynamically changed by DCI. Morespecifically, it may be regulated that the channel is mapped to adifferent CC and/or BWP in each symbol.

Characteristically, each state of an ARI may correspond to a CC and/or aBWP in which a PUCCH is transmitted, together with a PUCCH resource, andone of the states may be indicated by DCI. Herein, BWPs may correspondto different CCs. For a PUSCH, a BWP in which the PUSCH is transmittedmay be indicated by DCI. Alternatively, an ARI-like field may be definedin a UL grant, each state of the ARI-like field may correspond to aresource for transmitting a PUSCH and/or a CC and/or a BWP in which thePUSCH is transmitted, and one of the states may be indicated by DCI.

In another method, it may be regulated that each state of the ARI (oranother DCI field) corresponds to a plurality of PUCCH (PUSCH) resourcesand/or a plurality of CCs and/or a plurality of BWPs in which a PUCCH(PUSCH) is to be transmitted. This may enable more flexible selection ofPUCCH (PUSCH) transmission resources. The UE may select one of PUCCH(PUSCH) resources indicated by the ARI (or another DCI field) and/or oneor more of the CCs and/or one or more of the BWPs to transmit the PUCCH(PUSCH).

In another method, the UE may select a CC and/or a BWP in which thePUCCH (PUSCH) is to be transmitted. Characteristically, a (set of)plurality of CC candidates and/or BWP candidates may be indicated by thenetwork, and a CC and/or a BWP for transmitting the PUCCH (PUSCH) may beselected from among the CC candidates and/or the BWP candidates.

In another method, only a PUCCH/PUSCH transmission is triggered by DCI,and the UE selects a UL resource randomly or in a predetermined rulefrom among UL resources configured for grant-free transmission in eachCC and/or BWP and performs a UL transmission in the selected ULresource.

The method of indicating/configuring a CC and/or a BWP may be performedindependently (differently) for each symbol in which the PUCCH/PUSCH istransmitted.

In the operation of dynamically selecting a CC/BP for a PUCCH, it may beregulated that when a PUSCH is scheduled in aconfigured/indicated/selected CC and/or BWP, a UE which is not capableof/configured with simultaneous PUCCH/PUSCH transmission piggybacksentire UCI or (high-priority) partial UCI of a PUCCH to PUSCH(s). Inanother method, it may be regulated that the PUCCH is transmitted, whilethe PUSCH is dropped, in a corresponding CC and/or BWP. Which operationbetween the above two operations is to be performed by the UE may beconfigured by a higher-layer signal or indicated by DCI.

For a UE capable or/configured with simultaneous PUCCH/PUSCHtransmission, particularly when a PUCCH transmission CC is not a PCell,the following prioritization may be considered in power allocation.

Alt 1: PUCCH on SCell(s)>PUSCH with UCI>PUSCH without UCI

Alt 2: PUSCH with UCI>PUCCH on SCell(s)>PUSCH without UCI

It may be regulated that in a power-limited situation, the UE performspower reduction and/or drop on channels in an ascending order ofpriority in the above prioritization. It may be regulated that power isscaled down equally across all or a part of the channels, for powerreduction.

When the above CC/BP selection method is applied to PUCCH transmission,it may be regulated that a power control or a transmission power control(TPC) is shared. Alternatively, when a CC and/or a BWP in which a PUCCHis transmitted is dynamically changed by DCI, it may be regulated that apower control or a TPC is also applied only to the corresponding CCand/or BWP. Alternatively, when a group TPC is defined as in DCI format3/3A, it may be regulated that group TPC information ismonitored/received from each CC and/or each BWP of an SCell as well as aPCell, to apply the group TPC information to PUCCH transmission in theCC and/or BWP. Alternatively, DCI including a group TPC may betransmitted in a specific CC and/or BWP, further including informationabout a CC and/or a BWP to which the group TPC is to be applied.

Hopping Pattern Selection

In order to maximize reliability, a method of repeatedly transmitting asignal in multiple carriers/frequencies/BWPs may be considered. However,simultaneous transmissions may not be performed depending on the powerlimit or the situation of the UE. In this case, only one transmission isperformed at a time, but in a manner that maximizes frequency diversity.One proposal may be to use a different frequency hopping unit andpattern according to a target BLER and/or a QoS requirement and/or aservice type and/or a numerology. For a PUSCH, for example, hopping mayoccur every K symbols, aside from existing inter-slot hopping or onehopping in one slot, and there may be multiple K values. A hoppingfunction may also be different according to a hopping unit, and one ofthe reasons for different hopping functions is that different resourcesmay be configured in each hopping unit to reduce collisions betweenresources having different hopping units, and a different hoppingpattern is set to perform hopping in the hopping unit.

In order to maximize frequency diversity, not only hopping within one CCbut also cross-CC hopping may occur. Since different CCs are activatedfor each UE, this configuration may be UE-specific. Alternatively, across-CC hopping unit may be commonly applied to UEs, with differenthopping levels in CCs. For a PUCCH, multiplexing between UEs isimportant, and thus, a semi-static or dynamic indication may be providedas to whether cross-CC scheduling is possible according to themultiplexing.

Alternatively, a CC in which a PUCCH is transmitted for multiplexing maybe dynamically changed for a group of UEs. For example, throughcell-specific signaling, CC A and CC B may be configured to be used in“even-numbered” and “odd-numbered” slots or in the half-slots of oneslot. A UE accessing all of the cells may dynamically change the ULfrequency between CC A and CC B. To support this scheme, the UE may needto support UL for both of CC A and CC B. Characteristically, CC A and CCB may be intra-band UL or may be different bands. Particularly when CC Aand CC B are configured in low and high frequency ranges, it is alsoassumed that different numerologies may be used, and a numerology and aresource configuration set for each CC may be followed at eachtransmission timing. In consideration of different numerologies or thelike, a slot size may be determined according to a DL numerology or thesmallest of the subcarrier spacings of UL CCs, or may beconfigured/indicated (e.g., between CC A and CC B) by ahigher-layer/physical-layer signal from the network.

UCI Feedback with Different Service Type or Different Target BLER

When transmission resources (e.g., time) of HARQ-ACKs for data havingdifferent target services and/or QoSs and/or BLER requirements overlapwith each other, it may be regulated that a lower-priority HARQ-ACKamong the HARQ-ACKs is dropped, or bundling/multiplexing of HARQ-ACKsfor data having different target services and/or QoSs and/or BLERrequirements is not allowed. Herein, priorities may be given such thateMBB<URLLC or a higher priority may be assigned to a higher BLERrequirement.

Alternatively, it may be regulated that the plurality of HARQ-ACKs aretransmitted bundled/multiplexed on one channel. Characteristically, theplurality of HARQ-ACKs may be transmitted bundled/multiplexed on ahigher-priority HARQ-ACK channel or a channel corresponding to astricter BLER requirement.

Alternatively, it may be regulated that the plurality of HARQ-ACKs aretransmitted on separate channels. Characteristically, the HARQ-ACKs maybe allowed to be transmitted on separate channels, only when the UE isin a non-power-limited situation at the time. Alternatively, since anexcessive peak to average power ratio (PAPR) may not be desirable, theseparate HARQ-ACK channel transmission may be allowed only when aspecific waveform (e.g., cyclic prefix-OFDM (CP-OFDM)) is used on theUL. If this operation causes a power-limited situation, a lower-priorityHARQ-ACK may be dropped or transmitted bundled/multiplexed on ahigher-priority HARQ-ACK channel, a higher-power channel, or a lowercoding-rate channel.

The above proposal may be similarly applied to a HARQ-ACK and CSIcombination and/or a CSI and CSI combination.

It may be regulated that when the number of coded symbols (i.e., REs inthe LTE standard) for UCI transmission in a PUSCH is calculated, a(different) beta offset is configured independently according to atarget service/QoS for which UCI is or a target BLER for that UCI, andthe UCI is transmitted piggybacked to the PUSCH by applying this(determining UCI transmission REs and performing UCI mapping to theREs). Alternatively, the number of coded symbols (i.e., REs in the LTEstandard) for UCI transmission in a PUSCH may be configuredindependently (or differently) according to a target service/QoS forwhich UCI is, or a target BLER or TTI length/subcarrier spacing for thatUCI.

For a specific UL waveform (e.g., CP-OFDM), a power-related parameterfor coded symbols (i.e., REs in the LTE standard) for UCI transmissionmay be configured or indicated by a higher-layer signal or DCI,separately (differently) from a power-related parameter for codedsymbols for data transmission. For example, signaling may be definedsuch that the power of coded symbols for UCI transmission relative tothe power of coded symbols for data transmission is determined to be anoffset or ratio.

DCI Design for CC/TRP Diversity

If data is transmitted/received in a plurality of CCs/TRPs throughrepetition or segmentation, as illustrated in FIG. 9 , it may beregulated that each DCI scheduling the repeated or segmentedtransmission schedules only data to be transmitted/received in eachCC/TRP. In this case, information indicating that the datatransmitted/received in the plurality of CCs/TRPs may be combined may beincluded in each scheduling DCI or separate DCI (e.g., group-common DCI)or preconfigured by a higher-layer signal, so that the UE may combinethe data transmitted/received in the plurality of CCs/TRPs throughrepetition or segmentation.

In another method, DCI scheduling a specific CC/TRP may includescheduling information for data to be transmitted/received in theplurality of CCs/TRP. More specifically, the single DCI may includenecessary information such as resource allocation and/or an MCS for theplurality of CCs/TRPs. Upon receipt may consider that schedulings of theplurality of CCs/TRPs may be combined without an additional signal andaccordingly, performs a data transmission/reception operation. It may beregulated that the scheduling information (e.g., an MCS, an RA, and soon) is signaled separately for the plurality of CCs/TRPs, or is selectedfrom among preset/preconfigured candidates or is a common value inconsideration of signaling overhead.

In another method, it may be regulated that DCI including schedulinginformation for data to be transmitted/received in a plurality ofCCs/TRPs is repeatedly transmitted in the plurality of (or apredetermined part of) CCs/TRPs. In this case, since the UE may performtransmission/reception in all of the CCs/TRPs as long as the DCIreception is successful even in a part of the plurality of CCs/TRPs,this may help with more reliable transmission/reception.

Mapping Rule for Carrier Diversity

When one TB/CBG/CB is segmented and mapped to a plurality of CCs, amethod of mapping TB/CBG/CB segments to a plurality of layers,subcarrier spacings, and symbols is proposed.

Alt 1: The TB/CBG/CB segments are first mapped in the order of layer,frequency domain, and time domain in one CC, and then mapped inCC-domain units. In this case, since mapping may be performed only in aspecific CC, it may be regulated that this method is applied only to aTB/CBG/CB equal to or larger than a predetermined TB/CBG/CB size. Themapping may first be performed in K symbols, then across the CC, and inthe remaining symbols again according to the above rule.

Alt 2: Mapping is performed in the order of layer, frequency domain, CCdomain, and time domain, or in the order of layer, CC domain, frequencydomain, and time domain. This method may be considered for a shorterprocessing time because the time-domain mapping is performed in the lastplace.

If carriers have different numbers of layers, different scheduled PRBsizes, or different slot lengths, mapping may be completed first in thecarrier with the smaller number of layers, the smaller scheduled PRBsize, or the smaller slot length. In this case, mapping may be performedby applying the same rule only to a carrier in which resources remain inthe layer/frequency/time domain.

If the CCs have different numerologies (e.g., subcarrier spacings), itmay be regulated that time-domain mapping is performed a plurality oftimes for the remaining larger subcarrier spacings with respect to thesmallest subcarrier spacing, so that the time-domain mapping isperformed at the same level as for the smallest subcarrier spacing. Forexample, when CC 1 and CC 2 are set to subcarrier spacings of 15 kHz and30 kHz, respectively, mapping to time index #n of CC 1 may be followedby mapping to time indexes #2n and #2n+1 of CC 2, for the samelayer/frequency/CC (or carrier) index. Alternatively, when the CCs havedifferent numerologies, a default numerology as a reference may bepredefined/preset or configured by a higher-layer signal. Alternatively,when the CCs have different numerologies, it may be regulated that anumerology corresponding to a PCell or a primary BWP is regarded as adefault numerology serving as a reference. Alternatively, when the CCshave different numerologies, it may be regulated that the segmentationoperation is not allowed. Alternatively, when the CCs have differentnumerologies, the segmentation operation may be performed only in CCshaving subcarrier spacings equal to or larger than a default subcarrierspacing serving as a reference.

The above mapping method may be applied only when an operation oftransmitting one TB/CBG/CB in a plurality of CC/TRPs is configured.Alternatively, whether the mapping method is applied may beconfigured/indicated by a higher-layer signal or DCI. Alternatively,whether the mapping method is applied may be determined based on the MCSand/or MCS and/or coding rate of the TB/CBG/CB.

Priority Rule Between Different CSI Feedbacks/SRS with Different BLERRequirements

Depending on the target service and/or BLER requirement of a CSIfeedback, a different priority may be assigned to the CSI feedback interms of power allocation and/or drop. Characteristically, it may beregulated that a high priority is assigned to a channel carrying CSIwith a stricter BLER requirement. For example, a PUSCH carrying CSI witha stricter BLER requirement may be transmitted with higher reliabilityby assigning a higher priority to CC 2 between a PUSCH with CSI (1e-1BLER) in CC1 and a PUSCH with CSI (1e-5 BLER) in CC2. That is, it may beregulated that in a power-limited situation, the PUSCH with CSI (1e-1BLER) in CC1 is first subjected to power reduction or dropped. Inanother example, power may be allocated to a PUSCH with priority over aPUCCH, with the remaining power available to the PUCCH by assigning ahigher priority to CC 2 between the PUCCH with CSI (1e-1 BLER) in CC1and the PUSCH with CSI (1e-5 BLER) in CC2. Further, it may be regulatedthat in a power-limited situation, the PUCCH with CSI (1e-1 BLER) in CC1is first subjected to power reduction or dropped.

The rule may be more generally defined such that a higher priority isassigned to a channel carrying UCI with a stricter BLER requirement. Itmay be regulated that a higher priority is assigned to CC 2 between aPUSCH with HARQ-ACK (1e-1 BLER) in CC1 and a PUSCH with HARQ-ACK (1e-5BLER) in CC2, so that in a power-limited situation, the PUSCH withHARQ-ACK (1e-1 BLER) in CC1 is first subjected to power reduction ordropped.

That is, channel type, UCI type, and BLER requirement (or service type)may be considered together in power allocation and/or drop. For example,priorities may be determined in the order of BLER requirement>UCI type(e.g., HARQ/SR>CSI>data)>channel type (e.g., PUCCH>PUSCH>SRS).

An SRS may be defined for a different target service and/or QoS and/orBLER requirement from a legacy one. More characteristically, it may beregulated that an SRS is transmitted separately for more accuratechannel estimation of a more latency-sensitive and/orreliability-sensitive service type and/or channel. Further, it may beregulated that a higher priority is assigned to a channel/SRS of aservice type with a stricter BLER requirement, and an SRS with astricter BLER requirement may ha a higher priority than a PUSCH. Forexample, priorities may be defined in the order of URLLC PUSCH>SRS (1e-5BLER requirement)>eMBB PUSCH>SRS (1e-1 BLER requirement). Morespecifically, the prioritization may be different according to aperiodic SRS and a (triggering-based) aperiodic SRS. For example,priorities may be defined in the order of A-SRS (1e-5 BLER)>HARQ-ACK(1e-1 BLER)>P-SRS (1e-5 BLER). Further, even for the aperiodic SRS,different priorities may be configured according to an SRS triggered byDCI for a PDSCH and an SRS triggered by DCI for a PUSCH.

Diversity Via DCI Combining

For high reliability requirements for specific traffic, the reliabilityof a control channel that schedules the traffic may also be important.Therefore, to improve the reliability of DCI, it may be regulated thatDCI is repeated for transmission. Specifically, the following methodsare available.

(Method 1) When DCI that schedules specific DL or UL data is repeatedlytransmitted, it may be regulated that each DCI is an individualtransmission and thus self-decodable, and there is no problem in datascheduling even though only one of the repeated DCIs is received.

(Method 2) When DCI that schedules specific DL or UL data is repeatedlytransmitted, it may be regulated that the DCI is transmitted by chasecombining (CC) or incremental redundancy (IR) and when the DCI isreceived, the DCI is decodable by combining.

To support (Method 2), the following method may be considered in DCIdecoding at the UE. Characteristically, it may be regulated that DCItransmitted in one candidate is individually decodable or DCIs in thesame candidates received in the same control resource sets (CORESETs) indifferent slots (or mini-slots or predefined or preconfigured monitoringintervals) are combinable by CC or IR.

In a characteristic example, in a first slot, the UE attempts Mdecodings for M candidates and stores the M candidates in a buffer. In asecond slot, the UE attempts M decodings for M candidates and stores theM candidates in a buffer. In addition, the UE stores M candidatesobtained by combining the stored candidates of the first slot with thenew candidates by CC in a buffer. In a third slot, the UE attempts Mdecodings for M candidates and stores the M candidates in a buffer. Inaddition, the UE stores M candidates obtained by combining the decodedand stored candidates of the second slot with the new candidates by CCin a buffer. Finally, the UE stores new M candidates obtained bycombining the stored M candidates resulting from the combining operationof the second slot with new candidates by CC or IR in a buffer. FIG. 10illustrates this procedure.

In general, it may be regulated that in addition to attempting Mdecodings for new M candidates and storing the decoded M candidates in abuffer in a K-th slot, the UE decodes additional (K−1)M decodings bycombining new candidates with candidates stored in the buffer and storesthe resulting decoded candidates in a buffer. Although the proposalrequires more blind decodings and a larger buffer amount, it offers theadvantage that DCI is decodable and a decoding gain for the DCI may beobtained, irrespective of a repetition number and/or without accurateknowledge of the starting point of repetitions.

More characteristically, it may be regulated that candidates transmittedwith the same CCE indexes are to be combined. Alternatively, it may beregulated that a CCE index (offset) of a candidate to be combined duringdecoding is determined by a value derived from a slot index (or asubframe or a radio frame or a mini-slot). Alternatively, informationabout the CCE index (offset) of the candidate to be combined may bepreconfigured by a higher-layer signal. Alternatively, the CCE index(offset) of the candidate to be combined may be dynamically indicated byspecific DCI. The rules may include relative CCE locations being thesame in CORESETs or applying an offset in a CORESET.

Similarly, it may be regulated that the same candidates in the sameCORESETs of different CCs are combinable by CC or IR. Alternatively, itmay be regulated that the same candidates in the same CORESETs ofdifferent antennas (antenna ports) are combinable by CC or IR.

When the above-described DCI combination is applied, it is necessary todetermine DCI that serves as a reference for a DL control-to-DL dataand/or UL grant-to-UL data timing and/or a DL data-to-HARQ timing.Therefore, in this case, it may be regulated that a flag for the DCI asa reference is included in DCI. Alternatively, it may be regulated thatDCI transmitted in a specific resource (or CORESET) configured by ahigher-layer signal (or indicated by DCI) is a reference for a DLcontrol-to-DL data and/or UL grant-to-UL data timing and/or a DLdata-to-HARQ timing. Alternatively, it may be regulated that DCItransmitted at a time corresponding to (or determined/derived from) aspecific mini-slot/slot/subframe/wireless-frame index is a reference fora DL control-to-DL data and/or UL grant-to-UL data timing and/or a DLdata-to-HARQ timing. Alternatively, it may be regulated that the UEfollows the timing indicated by each DCI.

Characteristically, a different starting slot (or mini-slot) may beconfigured for each PDCCH candidate (set). Information about thestarting slot (or mini-slot) may be configured for/indicated to the UEby a higher-layer signal and/or DCI. Alternatively, the starting slot(or mini-slot) of a specific PDCCH candidate (set) may be configured,and the starting slots (or mini-slots) of the remaining PDCCH candidates(candidate sets) may be determined based on a predefined pattern oroffset or a pattern or offset configured by ahigher-layer/physical-layer signal. For example, if it is indicated thatcandidate #1 starts in slot #1 and candidate #2 starts in slot #2, theUE may flexibly adjust the starting slot of each candidate, whileperforming combining more easily, by identifying the starting slot ofeach candidate.

Time Repetition/Segmentation

As one way to ensure reliability, time repetition/segmentation of achannel may be considered. For higher reliability, a channel for trafficcorresponding to a specific target service and/or QoS and/or requirementmay be transmitted in a plurality of TTIs through repetition orsegmentation. If DMRS overhead is burdening for reasons such as a(short) TTI length, a structure in which multiple TTIs share the DMRSmay be considered. In the case of time repetition/segmentation, acontrol channel that schedules this may not be transmitted in each TTI,and thus TTIs in which the DMRS is to be transmitted/included may bepredefined by predefining a DMRS pattern. Alternatively, a plurality ofpatterns may be defined and a pattern may be configured by ahigher-layer signal or dynamically indicated by DCI. The DMRS patternmay be applied according to each sTTI or TTI in repetition occurs, ormay be configured according to an sTTI index or a slot index.

For example, when the DMRS is configured in a pattern {[DR] [DD] [RD][DD]}, the pattern may be applied from the starting point of repetitionsor may be unconditionally repeated every 4 sTTIs. Alternatively, thepattern may be fixedly mapped to specific sTTI indexes at all time. In2-OFDM symbol (OS) and 3-OS sTTIs, D may be attached before or after a2OS-based pattern, or a different pattern may be given. Further, in thecase of a transmission configured without a grant, like SPS, a patternto be used may be configured or indicated by valid DCI. If datatransmitted without a grant is used for a retransmission in addition toan initial transmission, an RS pattern used for the retransmission maybe configured to be different from an RS pattern of the initialtransmission. Likewise, a similar pattern or operation may be consideredfor the presence or absence of the DMRS or a DMRS pattern, or a usedscrambling ID. In addition, if there are multiple resourceconfigurations, it is possible to configure/indicate such a pattern foreach resource configuration.

In the case of a subslot (of a 2-symbol or 3-symbol sTTI) operation, thestructure of a DL TTI in a subframe is determined by the length of a CFIindicated by a PCFICH. If the CFI is 1 or 3, one subframe including 14symbols includes 6 sTTIs of {3,2,2,2,2,3}. When the CFI is 2, onesubframe includes 6 sTTIs of {2,3,2,2,2,3}. If the UE fails to obtain acorrect CFI value due to failure in PCFICH decoding, the UE may notdetermine the sTTI structure in the corresponding subframe. For URLLCtraffic, this error may be undesirable and thus require handling.

It may be regulated that only symbol indexes #3 and #4 are used forDL-SCH mapping in the second sTTI of a subframe. This has the advantagethat the same DL-SCH reception performance may be expected regardless ofthe PCFICH decoding error. Alternatively, it may be regulated thatmapping is performed for symbol index #2 after DL-SCH mapping iscompleted for symbol indexes #3 and #4 in the second sTTI of thesubframe. In other words, at least a part corresponding to systematicbits may be mapped first, followed by mapping the remaining part (thepresence of which the UE may not be sure) to symbol index #2.Alternatively, in consideration of such an operation, when the UEreceives a NACK, data mapped to sTTI #0 or #1 whose sTTI mapping ischanged according to the PCFICH may be flushed. That is, when mapping isnot certain in a specific sTTI, the UE may exclude the sTTI fromHARQ-ACK combining. Alternatively, the UE may assume that a repetitionoccurs in cross-subframes only when the PCFICH of the previous subframeis the same. Therefore, when the PCFICH value is different from that inthe previous subframe, the UE may ignore the repetition mapped to thecorresponding sTTI, determining that the detection of the PCFICH doesnot have high reliability. Alternatively, it may be assumed thatcross-subframe repetition is allowed only when a PCFICH value is equalto a configured value. That is, when cross-subframe repetition isscheduled, the UE assumes a CFI value which is preset orconfigured/indicated by a higher-layer/physical-layer signal to be theCFI value of a corresponding subframe.

Repetition and Subband/BWP Switching

While the UE is performing repetition, a DL or UL subband or BWPconfigured for the UE may be changed. Such examples may include a casein which the UE moves to a default subband/BWP by a default timer or acase in which subband/BWP switching occurs. In this case, the repetitionmay continue in a new subband/BWP or the subband/BWP may not be changeduntil the repetition ends in switching or the repetition ends.Alternatively, the network may configure an operation to be performed.Alternatively, the repetition may continue if a resource in which therepetition is performed is included in the old/new subband/BWP.Alternatively, BWP switching and repetition may be continued accordingto a UE capability. For example, when a UL BWP is changed according to aDL BWP in an unpaired case, the DL BWP may be changed, but the UL BWPmay not be changed for the repetition and may be changed after therepetition. Depending on UE implementation, the repetition may beterminated at a corresponding time or continued.

The UE may report whether it has the capability of supporting BWPswitching and repetition at the same time, or the network may define aconfiguration for a corresponding operation by a higher-layer signal. Ifthe UE is not capable of supporting the operation and/or the network hasnot configured the operation, the UE does not expect BWP switching to beset/indicated during the repetition. Alternatively, in this case, the UEmay terminate the repetition, when BWP switching occurs.

Since examples of the above proposed methods may be included as one ofmethods of implementing the present disclosure, it is apparent that theexamples may be regarded as proposed methods. Further, the foregoingproposed methods may be implemented independently, or some of themethods may be implemented in combination (or merged). Further, it maybe regulated that information indicating whether the proposed methodsare applied (or information about the rules of the proposed methods) isindicated to a UE by a pre-defined signal (or a physical-layer orhigher-layer signal) by an eNB.

FIG. 11 is a block diagram of a transmitting device 10 and a receivingdevice 20 configured to implement exemplary embodiments of the presentdisclosure. Referring to FIG. 6 , the transmitting device 10 and thereceiving device 20 respectively include transmitter/receiver 13 and 23for transmitting and receiving radio signals carrying information, data,signals, and/or messages, memories 12 and 22 for storing informationrelated to communication in a wireless communication system, andprocessors 11 and 21 connected operationally to the transmitter/receiver13 and 23 and the memories 12 and 22 and configured to control thememories 12 and 22 and/or the transmitter/receiver 13 and 23 so as toperform at least one of the above-described embodiments of the presentdisclosure.

The memories 12 and 22 may store programs for processing and control ofthe processors 11 and 21 and may temporarily storing input/outputinformation. The memories 12 and 22 may be used as buffers. Theprocessors 11 and 21 control the overall operation of various modules inthe transmitting device 10 or the receiving device 20. The processors 11and 21 may perform various control functions to implement the presentdisclosure. The processors 11 and 21 may be controllers,microcontrollers, microprocessors, or microcomputers. The processors 11and 21 may be implemented by hardware, firmware, software, or acombination thereof. In a hardware configuration, application specificintegrated circuits (ASICs), digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs), orfield programmable gate arrays (FPGAs) may be included in the processors11 and 21. If the present disclosure is implemented using firmware orsoftware, firmware or software may be configured to include modules,procedures, functions, etc. performing the functions or operations ofthe present disclosure. Firmware or software configured to perform thepresent disclosure may be included in the processors 11 and 21 or storedin the memories 12 and 22 so as to be driven by the processors 11 and21.

The processor 11 of the transmitting device 10 is scheduled from theprocessor 11 or a scheduler connected to the processor 11 and codes andmodulates signals and/or data to be transmitted to the outside. Thecoded and modulated signals and/or data are transmitted to thetransmitter/receiver 13. For example, the processor 11 converts a datastream to be transmitted into K layers through demultiplexing, channelcoding, scrambling and modulation. The coded data stream is alsoreferred to as a codeword and is equivalent to a transport block whichis a data block provided by a MAC layer. One transport block (TB) iscoded into one codeword and each codeword is transmitted to thereceiving device in the form of one or more layers. For frequencyup-conversion, the transmitter/receiver 13 may include an oscillator.The transmitter/receiver 13 may include Nt (where Nt is a positiveinteger) transmit antennas.

A signal processing process of the receiving device 20 is the reverse ofthe signal processing process of the transmitting device 10. Under thecontrol of the processor 21, the transmitter/receiver 23 of thereceiving device 10 receives RF signals transmitted by the transmittingdevice 10. The transmitter/receiver 23 may include Nr receive antennasand frequency down-converts each signal received through receiveantennas into a baseband signal. The transmitter/receiver 23 may includean oscillator for frequency down-conversion. The processor 21 decodesand demodulates the radio signals received through the receive antennasand restores data that the transmitting device 10 wishes to transmit.

The transmitter/receiver 13 and 23 include one or more antennas. Anantenna performs a function of transmitting signals processed by thetransmitter/receiver 13 and 23 to the exterior or receiving radiosignals from the exterior to transfer the radio signals to thetransmitter/receiver 13 and 23. The antenna may also be called anantenna port. Each antenna may correspond to one physical antenna or maybe configured by a combination of more than one physical antennaelement. A signal transmitted through each antenna cannot be decomposedby the receiving device 20. An RS transmitted through an antenna definesthe corresponding antenna viewed from the receiving device 20 andenables the receiving device 20 to perform channel estimation for theantenna, irrespective of whether a channel is a single RF channel fromone physical antenna or a composite channel from a plurality of physicalantenna elements including the antenna. That is, an antenna is definedsuch that a channel transmitting a symbol on the antenna may be derivedfrom the channel transmitting another symbol on the same antenna. Atransmitter/receiver supporting a MIMO function of transmitting andreceiving data using a plurality of antennas may be connected to two ormore antennas.

In embodiments of the present disclosure, a UE serves as thetransmission device 10 on UL and as the receiving device 20 on DL. Inembodiments of the present disclosure, an eNB serves as the receivingdevice 20 on UL and as the transmission device 10 on DL.

The transmitting device and/or the receiving device may be configured asa combination of one or more embodiments of the present disclosure.

As one of a combination of these proposals, a UE for transmitting anuplink signal in a plurality of serving cells in a wirelesscommunication system includes a receiver and a transmitter, and aprocessor configured to control the receiver and the transmitter. Theprocessor may be configured to receive a configuration indicatingwhether a repetition operation or a segmentation operation is enabledfor a PUCCH in at least one secondary serving cell, and transmit thePUCCH by repeating or segmenting the PUCCH in the at least one secondaryserving cell according to the received configuration, and theconfiguration includes information about a secondary serving cell and/ora BWP subjected to the repetition operation or the segmentationoperation.

Additionally, the processor may be configured to receive a resourceoffset to determine a resource for use in transmitting the PUCCH in thesecondary serving cell and/or the BWP, and determine the resource foruse in transmitting the PUCCH based on the resource offset.

Additionally, a resource offset may be configured for each secondaryserving cell and/or each BWP, and a PUCCH resource in the secondaryserving cell and/or the BWP may be determined to be a PUCCH resourcespaced from a PUCCH resource indicated by the received configuration bythe resource offset for the secondary serving cell and/or the BWP.

Additionally, a PUSCH scheduled in a part of the at least one secondaryserving cell may be dropped.

Additionally, when a simultaneous PUCCH and PUSCH transmission isconfigured for the UE, priority for transmission power allocation isdetermined according to a channel type, a serving cell index, andwhether UCI is included.

Additionally, the information about the secondary serving cell and/orthe BWP subjected to the repetition operation or the segmentationoperation may be changed by DCI related to the PUCCH.

Additionally, the PUCCH may be mapped to a different secondary servingcell and/or BWP in each symbol.

Additionally, each state of a specific field in the DCI may correspondto one of a plurality of secondary serving cells and/or BWPs, and uponreceipt of the DCI, a repetition or segment of the PUCCH may betransmitted in at least one secondary serving cell and/or BWP selectedfrom among the plurality of secondary serving cells and/or BWPs.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

The present disclosure may be used in a wireless communication devicesuch as a UE, a relay, an eNB, and so on.

What is claimed is:
 1. A method for transmitting a Hybrid AutomaticRepeat Request-Acknowledge (HARQ-ACK) by a user equipment (UE) in awireless communication system, the method comprising: receiving a firstPhysical Downlink Shared Channel (PDSCH); canceling a first uplinkchannel including a first HARQ-ACK which is a response to the firstPDSCH, wherein the first uplink channel is scheduled on a plurality ofresources including a first resource; receiving one or more secondPDSCHs; transmitting a second uplink channel including a second HARQ-ACKin response to the one or more second PDSCHs, wherein the second uplinkchannel is transmitted on the first resource, and wherein, based on thesecond uplink channel being a Physical Uplink Shared Channel (PUSCH), abeta offset for the second HARQ-ACK is determined based on a number ofbits of the second HARQ-ACK.
 2. The method of claim 1, wherein the firstuplink channel is dropped in the first resource.
 3. The method of claim1, wherein a priority of the first uplink channel is smaller than apriority of the second uplink channel.
 4. The method of claim 1, whereinthe first uplink channel is scheduled to be transmitted repeatedly onthe plurality of resources.
 5. The method of claim 1, wherein the firstuplink channel is a physical uplink control channel (PUCCH).
 6. A userequipment (UE) for transmitting a Hybrid Automatic RepeatRequest-Acknowledge (HARQ-ACK) in a wireless communication system, theUE comprising: at least one transceiver; at least one processor; and atleast one memory operably coupled to the at least one processor andstoring instructions which, when executed, cause the at least oneprocessor to perform operations comprising: receiving, through the atleast one transceiver, a first Physical Downlink Shared Channel (PDSCH);canceling a first uplink channel including a first HARQ-ACK which is aresponse to the first PDSCH, wherein the first uplink channel isscheduled on a plurality of resources including a first resource;receiving, through the at least one transceiver, one or more secondPDSCHs; transmitting, through the at least one transceiver, a seconduplink channel including a second HARQ-ACK in response to the one ormore second PDSCHs, wherein the second uplink channel is transmitted onthe first resource, and wherein, based on the second uplink channelbeing a Physical Uplink Shared Channel (PUSCH), a beta offset for thesecond HARQ-ACK is determined based on a number of bits of the secondHARQ-ACK.
 7. The UE of claim 6, wherein the first uplink channel isdropped in the first resource.
 8. The UE of claim 6, wherein a priorityof the first uplink channel is smaller than a priority of the seconduplink channel.
 9. The UE of claim 6, wherein the first uplink channelis scheduled to be transmitted repeatedly on the plurality of resources.10. The UE of claim 6, wherein the first uplink channel is a physicaluplink control channel (PUCCH).
 11. A non-transitory computer readablestorage medium storing at least one computer program comprisinginstructions that, when executed by at least one processor, cause the atleast one processor to perform operations, the operations comprising:receiving a first Physical Downlink Shared Channel (PDSCH); canceling afirst uplink channel including a first HARQ-ACK which is a response tothe first PDSCH, wherein the first uplink channel is scheduled on aplurality of resources including a first resource; receiving one or moresecond PDSCHs; transmitting a second uplink channel including a secondHARQ-ACK in response to the one or more second PDSCH, wherein the seconduplink channel is transmitted on the first resource, and wherein, basedon the second uplink channel being a Physical Uplink Shared Channel(PUSCH), a beta offset for the second HARQ-ACK is determined based on anumber of bits of the second HARQ-ACK.
 12. A method for receiving aHybrid Automatic Repeat Request-Acknowledge (HARQ-ACK) by a base station(BS) in a wireless communication system, the method comprising:transmitting a first Physical Downlink Shared Channel (PDSCH); wherein afirst uplink channel including a first HARQ-ACK in response to the firstPDSCH is scheduled on a plurality of resources including a firstresource; transmitting one or more second PDSCHs; receiving a seconduplink channel including a second HARQ-ACK in response to the one ormore second PDSCHs, wherein the second uplink channel is received on thefirst resource; and wherein, based on the second uplink channel being aPhysical Uplink Shared Channel (PUSCH), a beta offset for the secondHARQ-ACK is determined based on a number of bits of the second HARQ-ACK.13. A base station (BS) for receiving a Hybrid Automatic RepeatRequest-Acknowledge (HARQ-ACK) in a wireless communication system, theBS comprising: at least one transceiver; at least one processor; and atleast one memory operably coupled to the at least one processor andstoring instructions which, when executed, cause the at least oneprocessor to perform operations comprising: transmitting, through the atleast one transceiver, a first Physical Downlink Shared Channel (PDSCH);wherein a first uplink channel including a first HARQ-ACK in response tothe first PDSCH is scheduled on a plurality of resources including afirst resource; transmitting, through the at least one transceiver, oneor more second PDSCHs; receiving, through the at least one transceiver,a second uplink channel including a second HARQ-ACK in response to theone or more second PDSCH, wherein the second uplink channel is receivedon the first resource; and wherein, based on the second uplink channelbeing a Physical Uplink Shared Channel (PUSCH), a beta offset for thesecond HARQ-ACK is determined based on a number of bits of the secondHARQ-ACK.